Make it clear in the doc that 'all' in LLVM_ENABLE_PROJECTS does install ALL projects

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375337 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CMake.rst b/docs/CMake.rst
index 9cc5f63..6e385d8 100644
--- a/docs/CMake.rst
+++ b/docs/CMake.rst
@@ -369,7 +369,7 @@
 
 **LLVM_ENABLE_PROJECTS**:STRING
   Semicolon-separated list of projects to build, or *all* for building all
-  (clang, libcxx, libcxxabi, lldb, compiler-rt, lld, polly) projects.
+  (clang, libcxx, libcxxabi, lldb, compiler-rt, lld, polly, etc) projects.
   This flag assumes that projects are checked out side-by-side and not nested,
   i.e. clang needs to be in parallel of llvm instead of nested in `llvm/tools`.
   This feature allows to have one build for only LLVM and another for clang+llvm