Dear Dave,

It seems it has already been fixed. If I check the reference link from your comment, I see the following in the last paragraph of the main section (just above the Wildcard header):

Built-in matchers ... are divided into several categories. All matchers are defined in the ::testing namespace unless otherwise noted.

Could you please confirm that?

That covers the namespace but not what to #include.

That covers the namespace but not what to #include.

Yeah, that makes sense.

I created a PR. Let's see if it gets merged. Feel free to review it too.

From your comment:

Marchers.md was just an example. You need to do this for all of the files in the documentation, and double check that the name spaces are also specified.

I figured that the guides are fine, because they are teaching how to use the tool, not sure that information belongs there. Also the code snippets do mention the namespace one way or another.

I believe the most critical part are the references, that is why I checked testing, mocking, assertions, matchers and actions.
And to me it seems that the matchers and actions are the only ones which didn't reference the correct header and/or namespace.

The code snippets I saw do not mention the namespace nor do they have #include directives. Remember that users will often jump to documentation for a specific facility rather than reading a whole page where that documentation is given. Whether you want to address this is of course up to you; I have no further comments.