frameworks/rs: fix typos and clang-tidy warnings

This change fixes a few typos and clang tidy warnings related to the
"llvm-namespace-comment" checks.

Bug: 26936282
Test: WITH_TIDY=1 WITH_TIDY_CHECKS="llvm-namespace-comment" mm
Change-Id: Ic65182e5b4999fbd48d6a8ad7172e4bfeeb541f4
diff --git a/rsScriptC.cpp b/rsScriptC.cpp
index 96ba192..70da651 100644
--- a/rsScriptC.cpp
+++ b/rsScriptC.cpp
@@ -467,5 +467,5 @@
     return s;
 }
 
-}
-}
+} // namespace renderscript
+} // namespace android