need to rebaseline (changed) c_gms, update dox

BUG=skia:
TBR=
NOTRY=True

Review URL: https://codereview.chromium.org/844663002
diff --git a/expectations/gm/ignored-tests.txt b/expectations/gm/ignored-tests.txt
index e692860..d11fcb3 100644
--- a/expectations/gm/ignored-tests.txt
+++ b/expectations/gm/ignored-tests.txt
@@ -40,3 +40,5 @@
 # New shadow only option in SkDropShadowImageFilter
 dropshadowimagefilter
 
+# reed -- changed gm, will rebase
+c_gms
diff --git a/include/core/SkImageGenerator.h b/include/core/SkImageGenerator.h
index cbceaa2..2967974 100644
--- a/include/core/SkImageGenerator.h
+++ b/include/core/SkImageGenerator.h
@@ -36,7 +36,7 @@
 SK_API bool SkInstallDiscardablePixelRef(SkImageGenerator*, SkBitmap* destination);
 
 /**
- *  On success, installs a discradable pixelref into destination, based on encoded data.
+ *  On success, installs a discardable pixelref into destination, based on encoded data.
  *  Regardless of success or failure, the caller must still balance their ownership of encoded.
  */
 SK_API bool SkInstallDiscardablePixelRef(SkData* encoded, SkBitmap* destination);