Update doc/cmake.rst

Co-authored-by: David Snopek <[email protected]>

Author: enetheru

doc/cmake.rst

@@ -51,7 +51,7 @@ Basic walkthrough
 
 .. topic:: Configure the build
 
-    CMake doesn't build the code, generates the files that another tool uses
+    CMake doesn't build the code, it generates the files that another tool uses
     to build the code. To see the list of generators run ``cmake --help``. The
     first phase of which is running through the configuration scripts.