remove outdated

googlemock/docs/documentation.md

-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](for_dummies.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.
-  * [DesignDoc](design_doc.md) -- design of and rationale behind some Google Mock features.
-  * [FrequentlyAskedQuestions](gmock_faq.md) and [KnownIssues](known_issues.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.