docs: improve wording on some pages according to alex.js

[vcapretz]

closes #9537

PR for improving the docs to avoid condescending language.
Some cases can be very opinionated so I didn't change every suggestion was offered when running npx alex inside the repo (it tells to be careful about usage of "Hook" which in React context is justified and totally ok).

Check issue for more reference, but here are some of the inputs I acted on 😄

• warning disabled may be insensitive, use turned off, has a disability, person with a disability, people with disabilities instead
• warning Be careful with executes, it’s profane in some cases
• warning simply may be insensitive, try not to use it
• warning easily may be insensitive, try not to use it
• warning just may be insensitive, try not to use it
• warning Be careful with execute, it’s profane in some cases
• Be careful with executed, it’s profane in some cases
• warning special may be insensitive

Let me know if have other suggestions and thank you for the time reviewing this PR! 🎉

[ijjk]

Stats from current PR

Default Server Mode (Decrease detected ✓)

General

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
buildDuration	12.8s	13.2s	⚠️ +388ms
nodeModulesSize	55.5 MB	55.5 MB	✓

Page Load Tests Overall decrease ⚠️

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.251	2.226	-0.02
/ avg req/sec	1110.78	1123.19	⚠️ +12.41
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.25	1.278	⚠️ +0.03
/error-in-render avg req/sec	2000.71	1956.69	-44.02

Client Bundles (main, webpack, commons)

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
main-HASH.js gzip	6.25 kB	6.25 kB	✓
webpack-HASH.js gzip	746 B	746 B	✓
de003c3a9d30..5e5e.js gzip	10.3 kB	10.3 kB	✓
framework.a1..NSE.txt gzip	220 B	220 B	✓
framework.a1..NSE.txt gzip	220 B	220 B	✓
framework.HASH.js gzip	39 kB	39 kB	✓
Overall change	56.7 kB	56.7 kB	✓

Client Bundles (main, webpack, commons) Modern

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
main-HASH.module.js gzip	4.79 kB	4.79 kB	✓
webpack-HASH..dule.js gzip	746 B	746 B	✓
de003c3a9d30..dule.js gzip	6.85 kB	6.85 kB	✓
framework.HA..dule.js gzip	39 kB	39 kB	✓
Overall change	51.4 kB	51.4 kB	✓

Legacy Client Bundles (polyfills)

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
polyfills-HASH.js gzip	26.2 kB	26.2 kB	✓
Overall change	26.2 kB	26.2 kB	✓

Client Pages

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
_app.js gzip	1.24 kB	1.24 kB	✓
_error.js gzip	3.12 kB	3.12 kB	✓
hooks.js gzip	664 B	664 B	✓
index.js gzip	222 B	222 B	✓
link.js gzip	2.06 kB	2.06 kB	✓
routerDirect.js gzip	279 B	279 B	✓
withRouter.js gzip	278 B	278 B	✓
Overall change	7.86 kB	7.86 kB	✓

Client Pages Modern

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
_app.module.js gzip	602 B	602 B	✓
_error.module.js gzip	2.09 kB	2.09 kB	✓
hooks.module.js gzip	383 B	383 B	✓
index.module.js gzip	223 B	223 B	✓
link.module.js gzip	1.52 kB	1.52 kB	✓
routerDirect..dule.js gzip	281 B	281 B	✓
withRouter.m..dule.js gzip	278 B	278 B	✓
Overall change	5.38 kB	5.38 kB	✓

Client Build Manifests

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
_buildManifest.js gzip	61 B	61 B	✓
_buildManife..dule.js gzip	61 B	61 B	✓
Overall change	122 B	122 B	✓

Rendered Page Sizes

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
index.html gzip	929 B	929 B	✓
link.html gzip	938 B	938 B	✓
withRouter.html gzip	927 B	927 B	✓
Overall change	2.79 kB	2.79 kB	✓

---

Serverless Mode

General

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
buildDuration	14.4s	13.9s	-510ms
nodeModulesSize	55.5 MB	55.5 MB	✓

Client Bundles (main, webpack, commons)

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
main-HASH.js gzip	6.25 kB	6.25 kB	✓
webpack-HASH.js gzip	746 B	746 B	✓
de003c3a9d30..5e5e.js gzip	10.3 kB	10.3 kB	✓
framework.a1..NSE.txt gzip	220 B	220 B	✓
framework.a1..NSE.txt gzip	220 B	220 B	✓
framework.HASH.js gzip	39 kB	39 kB	✓
Overall change	56.7 kB	56.7 kB	✓

Client Bundles (main, webpack, commons) Modern

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
main-HASH.module.js gzip	4.79 kB	4.79 kB	✓
webpack-HASH..dule.js gzip	746 B	746 B	✓
de003c3a9d30..dule.js gzip	6.85 kB	6.85 kB	✓
framework.HA..dule.js gzip	39 kB	39 kB	✓
Overall change	51.4 kB	51.4 kB	✓

Legacy Client Bundles (polyfills)

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
polyfills-HASH.js gzip	26.2 kB	26.2 kB	✓
Overall change	26.2 kB	26.2 kB	✓

Client Pages

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
_app.js gzip	1.24 kB	1.24 kB	✓
_error.js gzip	3.12 kB	3.12 kB	✓
hooks.js gzip	664 B	664 B	✓
index.js gzip	222 B	222 B	✓
link.js gzip	2.06 kB	2.06 kB	✓
routerDirect.js gzip	279 B	279 B	✓
withRouter.js gzip	278 B	278 B	✓
Overall change	7.86 kB	7.86 kB	✓

Client Pages Modern

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
_app.module.js gzip	602 B	602 B	✓
_error.module.js gzip	2.09 kB	2.09 kB	✓
hooks.module.js gzip	383 B	383 B	✓
index.module.js gzip	223 B	223 B	✓
link.module.js gzip	1.52 kB	1.52 kB	✓
routerDirect..dule.js gzip	281 B	281 B	✓
withRouter.m..dule.js gzip	278 B	278 B	✓
Overall change	5.38 kB	5.38 kB	✓

Client Build Manifests

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
_buildManifest.js gzip	61 B	61 B	✓
_buildManife..dule.js gzip	61 B	61 B	✓
Overall change	122 B	122 B	✓

Serverless bundles

	zeit/next.js canary	vcapretz/next.js docs-improvements	Change
_error.js	558 kB	558 kB	✓
404.html	4.18 kB	4.18 kB	✓
hooks.html	3.81 kB	3.81 kB	✓
index.js	558 kB	558 kB	✓
link.js	594 kB	594 kB	✓
routerDirect.js	587 kB	587 kB	✓
withRouter.js	587 kB	587 kB	✓
Overall change	2.89 MB	2.89 MB	✓

[timneutkens]

Looks great 💯 Thanks! Really awesome contribution 😌