rename and apply snake_case on Documentation.md

googlemock/docs/documentation.md

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+This page lists all documentation markdown files for Google Mock **(the
+current git version)**
+-- **if you use a former version of Google Mock, please read the
+documentation for that specific version instead (e.g. by checking out
+the respective git branch/tag).**
+
+  * [ForDummies](ForDummies.md) -- start here if you are new to Google Mock.
+  * [CheatSheet](cheat_sheet.md) -- a quick reference.
+  * [CookBook](cook_book.md) -- recipes for doing various tasks using Google Mock.
+  * [FrequentlyAskedQuestions](FrequentlyAskedQuestions.md) -- check here before asking a question on the mailing list.
+
+To contribute code to Google Mock, read:
+
+  * [CONTRIBUTING](../../CONTRIBUTING.md) -- read this _before_ writing your first patch.
+  * [Pump Manual](../../googletest/docs/pump_manual.md) -- how we generate some of the source files.