Merge pull request #701 from microMolvi/patch-1

DevManual.md: fix grammar

docs/DevManual.md

@@ -29,7 +29,7 @@ by the generator.
 
 This is done in Parser.cpp, we walk the AST provided by Clang and mirror
 it in a .NET-friendly way. Most of this code is pretty straightforward if
-you are familiar how Clang represents C++ code in AST nodes.
+you are familiar with how Clang represents C++ code in AST nodes.
 
 Recommended Clang documentation: [http://clang.llvm.org/docs/InternalsManual.html](http://clang.llvm.org/docs/InternalsManual.html "Clang Internals")