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Added IsNan matcher

PiperOrigin-RevId: 275473218

Added IsNan matcher

PiperOrigin-RevId: 275278634

Move IsFalse/IsTrue to a more appropriate section in the gmock matchers cheat sheet.

I'm assuming their current placement within the "Container Matchers" list is a mistake -- they don't seem to be container related and would fit well with other generic matchers.

PiperOrigin-RevId: 268016027

...text exposed to GitHub repo https://www.github.com/google/googletest

PiperOrigin-RevId: 267654546

...text exposed to GitHub repo https://www.github.com/google/googletest

PiperOrigin-RevId: 267617889

Due to confusion arisen from "iff" standing for "if and only if",
this commit uses the latter.

Fix broken link to regex syntax guide in cheat_sheet.md

PiperOrigin-RevId: 263840914

Remove markdown extension which isn't supported on github.

PiperOrigin-RevId: 261321329

Add links to "sampleK_unittest.cc" examples. Fix some broken docs crosslinks.

PiperOrigin-RevId: 261169561

Preparation for including docs in round-trip with OSS, Manual merge, review and merge docs internal-OSS

Renaming doc files to make the file names more palatable and in preparation for including documentation in sync process

The Optional() matcher is otherwise undocumented except in the source.
This patch adds it to the cheat sheet for better visibility.

Rename AdvancedGuide.md to advanced.md and adjust the links. 
Part of documentation rationalization work