Suggestion

Follow up to #8133

I propose adding a new docs test that will assert that the code blocks (with Open in Playground button) contain at least syntatically valid code

Perhaps we could also test that code under Incorrect tab contains at least one lint error, and Correct code contains no errors

I wrote a simple test that tries to parse content of all code blocks. It turns out that the following files contain code block with syntax error:

docs/rules/consistent-type-assertions.md
docs/rules/explicit-function-return-type.md
docs/rules/member-ordering.md
docs/rules/no-empty-function.md
docs/rules/no-unnecessary-type-constraint.md
docs/rules/prefer-enum-initializers.md
docs/rules/prefer-readonly-parameter-types.md
docs/rules/space-before-blocks.md
docs/rules/typedef.md