Fix typo in cmake docs for EXTRA_COMPONENT_DIRS (IDFGH-16884)

[fermino]

I noticed a typo in the comments of tools/cmake/project.cmake referencing EXTRA_COMPONENT_DIRS, this fixes it.

It's nothing critical at all but it threw me off while digging through the code so here it is :)

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Note

Corrects comment in tools/cmake/project.cmake to reference EXTRA_COMPONENT_DIRS consistently.

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[fhrbata]

Hello @fermino , thank you for the fix! I left one comment that we should probably also remove the COMPONENTS_DIRS variable too. Otherwise LGTM. Thank you!

[fhrbata]

Hello @fermino , I think we can also remove the COMPONENTS_DIRS variable, because I don't see it used anywhere in the build system. It seems only COMPONENT_DIRS is supported. Thank you