CMake: Update documentation to require CMake 3.7 or later

Tealeaf mode has been removed, so update the documentation accordingly.

Change-Id: Ibecc2f127f3acb5d6813e4f670c3424db633cacb
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

doc/qtcreator/src/cmake/creator-projects-cmake.qdoc

@@ -60,12 +60,9 @@
 
     \section1 Adding CMake Tools
 
-    \QC supports CMake version 3.0, or later. For best results you should use
-    CMake version 3.7.2 with server-mode support, or later. Earlier versions
-    provide less information to the code model, which will then fail to resolve
-    includes and defines.
+    \QC supports CMake version 3.7, or later.
 
-    For CMake version 3.14, or later, \QC supports the
+    For best results use CMake version 3.14, or later, as \QC supports the
     \l {https://cmake.org/cmake/help/latest/manual/cmake-file-api.7.html}
     {file-based API}.