clang-format: Remove sentence in option cost threshold that weakens the

statement. Specifically, we don't want people that have already written
a patch to just write a style guide for their 1-person project.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@249290 91177308-0d34-0410-b5e6-96231b3b80d8

docs/ClangFormatStyleOptions.rst

@@ -606,8 +606,6 @@ options. Each new style option must ..
   * .. have a publicly accessible style guide
   * .. have a person willing to contribute and maintain patches
 
-At least two out of these three need to be met.
-
 Examples
 ========