Spelling and grammar fixes

[scop]

Proposed change

Spelling and grammar fixes.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[NoRi2909]

Great cleanup! You did not catch this one:

"To assign a category to an scene it needs to have a unique ID."

[scop]

Yeah, the tool I used to find these reports only one finding per line, sometimes I catch more when reviewing its findings "manually", sometimes not, and I tend to not run it multiple times. Besides that, it's highly likely that more uncaught ones remain, but at least it's a step in the right direction :)

[NoRi2909]

@scop I've included the fix for the remaining "an" in new PR #23624