Fix broken link for Sphinx installation

diff --git a/llvm/docs/CMake.rst b/llvm/docs/CMake.rst
index 2972f1d..96994db 100644 (file)
--- a/llvm/docs/CMake.rst
+++ b/llvm/docs/CMake.rst
@@ -552,7 +552,7 @@ LLVM-specific variables
 **SPHINX_EXECUTABLE**:STRING
   The path to the ``sphinx-build`` executable detected by CMake.
   For installation instructions, see
-  http://www.sphinx-doc.org/en/latest/usage/installation.html
+  https://www.sphinx-doc.org/en/master/usage/installation.html
 
 **SPHINX_OUTPUT_HTML**:BOOL
   If enabled (and ``LLVM_ENABLE_SPHINX`` is enabled) then the targets for