Fix spelling issues

docs/contributor/CONTRIBUTING.md

@@ -42,13 +42,13 @@ The set of labels and their description can be found [here](https://paritytech.g
 3. If you’re still working on your PR, please submit as “Draft”. Once a PR is ready for review change the status to
    “Open”, so that the maintainers get to review your PR. Generally PRs should sit for 48 hours in order to garner
    feedback. It may be merged before if all relevant parties had a look at it.
-4. With respect to auditing, please see [AUDIT.md](../AUDIT.md). In general, merging to master can happen independent of
+4. With respect to auditing, please see [AUDIT.md](../AUDIT.md). In general, merging to master can happen independently of
    audit.
 5. PRs will be able to be merged once all reviewers' comments are addressed and CI is successful.
 
 **Noting breaking changes:** When breaking APIs, the PR description should mention what was changed alongside some
 examples on how to change the code to make it work/compile. It should also mention potential storage migrations and if
-they require some special setup aside adding it to the list of migrations in the runtime.
+they require some special setup aside from adding it to the list of migrations in the runtime.
 
 ## Reviewing pull requests
 

docs/contributor/DOCUMENTATION_GUIDELINES.md

@@ -136,7 +136,7 @@ the `macro@my_macro_name` syntax in your link. Read more about how to correctly
 
 The above five guidelines must always be reasonably respected in the documentation.
 
-The following are a set of notes that may not necessarily hold in all circumstances:
+The following is a set of notes that may not necessarily hold in all circumstances:
 
 ---
 
@@ -205,7 +205,7 @@ properly do this.
 
 ## Pallet Crates
 
-The guidelines so far have been general in nature, and are applicable to crates that are pallets and crates that're not
+The guidelines so far have been general in nature, and are applicable to crates that are pallets and crates that are not
 pallets.
 
 The following is relevant to how to document parts of a crate that is a pallet. See

docs/contributor/PULL_REQUEST_TEMPLATE.md

@@ -20,7 +20,7 @@ reviewed by reviewers, if the PR does NOT have the `R0-Silent` label. In case of
 
 ## Review Notes
 
-*In depth notes about the **implenentation** details of your PR. This should be the main guide for reviewers to
+*In depth notes about the **implementation** details of your PR. This should be the main guide for reviewers to
 understand your approach and effectively review it. If too long, use
 [`<details>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/details)*.
 

substrate/docs/SECURITY.md

@@ -8,7 +8,7 @@ required to address security issues.
 ## Reporting a Vulnerability
 
 Security vulnerabilities in Parity software should be reported by email to [email protected]. If you think your report
-might be eligible for the Parity Bug Bounty Program, your email should be send to [email protected].
+might be eligible for the Parity Bug Bounty Program, your email should be sent to [email protected].
 
 Your report should include the following: