fix（docs）: correct block matching condition in Executing Commands e…

[jerry-lllman]

Description
Fix a problem in the Executing Commands section of the documentation where the Generate Block command lacks judgement on the element, causing the code not to work.

Context
Applying Custom Formatting

Applying Custom Formatting

Checks

• The new code matches the existing patterns and styles.
• The tests pass with yarn test.
• The linter passes with yarn lint. (Fix errors with yarn fix.)
• The relevant examples still work. (Run examples with yarn start.)
• You've added a changeset if changing functionality. (Add one with yarn changeset add.)

[changeset-bot]

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Latest commit: a3c8367

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