Fix block description In-consistency

[Infinite-Null]

Closes: #69475

What?

This PR standardizes block descriptions in the /packages/block-library directory, ensuring verb tense and structure consistency.

Why?

Some descriptions use different verb tenses (e.g., “Display” vs. “Displays”). This PR aims to standardize descriptions using a third-person verb format where applicable.

How?

• Updated descriptions that start with a verb to use third-person singular (e.g., “Displays” instead of “Display”).
• Ensured consistency across all block descriptions in the block library.

Testing Instructions

1. Search for the description in block.json in /packages/block-library.
2. Also you can open the block editor and inspect block descriptions in the block settings panel.
3. Compare the description changes to ensure consistency.

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Co-authored-by: Infinite-Null <ankitkumarshah@git.wordpress.org>
Co-authored-by: cobianzo <cobianzo@git.wordpress.org>
Co-authored-by: talldan <talldanwp@git.wordpress.org>
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Co-authored-by: afercia <afercia@git.wordpress.org>

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[Infinite-Null]

Hi @afercia,
I have made the block description consistent please review it at your convenience.
Thank You!

[cobianzo]

Hi @Infinite-Null , cc @afercia
As you can see, I have spotted some more files that need updates after the texts changes ( documentation files and e2e test files) . I wonder how the Playwright tests didn't flag an error about it.

I also have one question, shouldnt' the text "Start with the basic building block of all narrative.", be updated into "Starts with the basic building block of all narrative.",?

Also, I'd like to flag @talldan comment on #70430 (comment) , asking for some more discussion on the issue itself.

[cobianzo]

Hi @Infinite-Null ,
I am not sure if this PR is still active. Just in case, I had a look to it, and I found an incongruence in the changes:
The text:
Start with the basic building block of all narrative
still exists in the codebase, either as descriptions in md files and in the block.json for paragraph. That is why the e2e spec fails.

I suggest to make a Ctrl+Shift+F and find all 'Start with the basic building block of all narrative', and replace it by Starts with the basic building block of all narrative

I believe that's the only thing missed in the PR.