include only LLDB API in docs generated by lldb-cpp-doc (cmake) target

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@186693 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/doxygen.cfg.in b/docs/doxygen.cfg.in
index b73f890..72eedca 100644
--- a/docs/doxygen.cfg.in
+++ b/docs/doxygen.cfg.in
@@ -581,9 +581,7 @@
 # directories like "/usr/src/myproject". Separate the files or directories
 # with spaces.
 
-INPUT                  = @abs_top_srcdir@/include \
-                         @abs_top_srcdir@/scripts/Python/interface \
-                         @abs_top_srcdir@/source \
+INPUT                  = @abs_top_srcdir@/include/lldb/API \
                          @abs_top_srcdir@/docs/doxygen.intro
 
 # This tag can be used to specify the character encoding of the source files