[ritfiz]

The basics

• I validated my changes

The details

Resolves

Towards #10550

Proposed Changes

Updates the wording in the Use CSS in Blockly and Build a Custom Generator codelabs to match the style used in #10575, #10609, #10615, and #10618:

• Instructions are written in the imperative, without "we", "let's", or "you need to" (for example, "Use statementToCode to get the code..." rather than "We'll use statementToCode to get the code...").
• Explanations that referred to "we" or "our" are reworded neutrally (for example, "The next section changes that" rather than "We will change that soon").
• "You" is kept for observations and stage-setting sentences at the start of a step.

Neither codelab referred to functions with trailing parentheses in its prose, so there are no functionName() changes.

Also fixes a few small issues found along the way:

• The "generators directory" link in the custom generator summary pointed to tree/main/generators, which no longer exists. It now points to tree/main/packages/blockly/generators.
• "the counts with block" is now "the count with block" in the CSS tour, matching the rest of the page.
• "colours from themes codelab" is now "colours from the themes codelab".
• "here is block generator" is now "here is the block generator", and "all of of the blocks" is now "all of the blocks".

Code samples and code comments are unchanged.

Reason for Changes

Consistent, imperative instructions make the codelabs easier to follow, especially for developers who read English as a second language.

Test Coverage

Ran eslint on the changed .mdx files with no errors, and checked that the new link target exists. Text-only changes, so no new tests.

Documentation

This PR is a documentation change.

Additional Information

This covers the last two codelabs in #10550. The codelab guide update is in a separate PR.

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