Change C++11 requirement to C++14

Version 1.13.x and later require C++14.

Also fix missing closing backtick.

googletest/README.md

@@ -124,10 +124,10 @@ match the project in which it is included.
 
 #### C++ Standard Version
 
-An environment that supports C++11 is required in order to successfully build
+An environment that supports C++14 is required in order to successfully build
 GoogleTest. One way to ensure this is to specify the standard in the top-level
-project, for example by using the `set(CMAKE_CXX_STANDARD 11)` command along
-with `set(CMAKE_CXX_STANDARD_REQUIRED ON). If this is not feasible, for example
+project, for example by using the `set(CMAKE_CXX_STANDARD 14)` command along
+with `set(CMAKE_CXX_STANDARD_REQUIRED ON)`. If this is not feasible, for example
 in a C project using GoogleTest for validation, then it can be specified by
 adding it to the options for cmake via the`-DCMAKE_CXX_FLAGS` option.