Extend some disclaimers

Author: NagyDonat

clang/docs/analyzer/user-docs/Options.rst.in

@@ -28,6 +28,13 @@ also accepted (with equivalent behavior). Analyzer options and checker options
 can be freely intermixed here because it's easy to recognize that checker
 option names are always prefixed with ``some.groups.NameOfChecker:``.
 
+.. warning::
+   This is an internal interface, Clang does not intend to preserve backwards
+   compatibility or announce breaking changes within the flags accepted by
+   ``clang -cc1``. However, ``-analyzer-config`` survived many years without
+   significant changes and there is no "more official" interface for
+   configuring the analyzer options.
+
 With the clang driver
 ---------------------
 
@@ -61,6 +68,10 @@ note the distinction that the ``clang`` *driver* requires ``--analyze`` (double
 dashes) while the ``clang -cc1`` *compiler frontend* requires ``-analyze``
 (single dash).
 
+.. note::
+   The flag ``-Xanalyzer`` is equivalent to ``-Xclang`` in these situations
+   (but doesn't forward other options of the clang frontend).
+
 With CodeChecker
 ----------------
 
@@ -89,9 +100,11 @@ List of analyzer options
 ========================
 
 .. warning::
-   These options are primarily intended for development purposes. Changing
-   their values may drastically alter the behavior of the analyzer, and may
-   even result in instabilities or crashes!
+   These options are primarily intended for development purposes and
+   non-default values are usually unsupported. Changing their values may
+   drastically alter the behavior of the analyzer, and may even result in
+   instabilities or crashes! Crash reports are welcome and depending on the
+   severity they may be fixed.
 
 ..
    The contents of this section are automatically generated by the script