[Bug web/71666] profile-generate not documented

[sandra at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71666
Bug 71666 depends on bug 23197, which changed state.

Bug 23197 Summary: Improve documentation on -fprofile-generate, -fprofile-use
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=23197

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED