Manual docs tweaks still in preparation for including docs with code pushes

googlemock/docs/cheat_sheet.md

 ## gMock Cheat Sheet
 
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 ### Defining a Mock Class
 

googlemock/docs/cook_book.md

 ## Googletest Mocking (gMock) Cookbook
 
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 You can find recipes for using gMock here. If you haven't yet, please read
 [this](for_dummies.md) first to make sure you understand the basics.

googlemock/docs/for_dummies.md

 ## Googletest Mocking (gMock) for Dummies {#GMockForDummies}
 
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 ### What Is gMock?
 

googlemock/docs/gmock_faq.md

 ## Legacy gMock FAQ {#GMockFaq}
 
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 ### When I call a method on my mock object, the method for the real object is invoked instead. What's the problem?
 

googletest/docs/advanced.md

 # Advanced googletest Topics
 
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 ## Introduction
 

googletest/docs/faq.md

 # Googletest FAQ
 
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 ## Why should test suite names and test names not contain underscore?