Remove old description of analyzer internals from public docs.

The file still exists in docs/analyzer/, but it won't be linked to from
clang.llvm.org or processed as part of the default Sphinx doc-build.
RegionStore has changed a lot from what Ted and Zhongxing describe here!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@170260 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/AnalyzerRegions.rst b/docs/analyzer/AnalyzerRegions.rst
similarity index 100%
rename from docs/AnalyzerRegions.rst
rename to docs/analyzer/AnalyzerRegions.rst
diff --git a/docs/index.rst b/docs/index.rst
index 66edeb1..f7cc62d 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -19,7 +19,6 @@
    ThreadSanitizer
    Tooling
    AddressSanitizer
-   AnalyzerRegions
    ClangPlugins
    ClangTools
    HowToSetupToolingForLLVM