[Documentation] Use HTTPS whenever possible

Differential revision: https://reviews.llvm.org/D56946

llvm-svn: 351976
diff --git a/clang/docs/JSONCompilationDatabase.rst b/clang/docs/JSONCompilationDatabase.rst
index 1f3441b..b576640 100644
--- a/clang/docs/JSONCompilationDatabase.rst
+++ b/clang/docs/JSONCompilationDatabase.rst
@@ -29,7 +29,7 @@
 Supported Systems
 =================
 
-Currently `CMake <http://cmake.org>`_ (since 2.8.5) supports generation
+Currently `CMake <https://cmake.org>`_ (since 2.8.5) supports generation
 of compilation databases for Unix Makefile builds (Ninja builds in the
 works) with the option ``CMAKE_EXPORT_COMPILE_COMMANDS``.