fix bookmaker

Mark experimental method in SkCanvas as "Experimental" in its
comment. Maybe it should be enough to name the routine experimental_...
but for now bookmaker requires the comment to say that as well.

Change the TextIntercept examples to #NoExample.

TBR=reed@google.com,bsalomon@google.com

Docs-Preview: https://skia.org/?cl=172402
Bug: skia:
Change-Id: Id74b59e141d5002a8b6118ca28cb9c62a36e2f02
Reviewed-on: https://skia-review.googlesource.com/c/172402
Reviewed-by: Cary Clark <caryclark@skia.org>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Cary Clark <caryclark@skia.org>
diff --git a/docs/undocumented.bmh b/docs/undocumented.bmh
index e2c3951..7bb7a11 100644
--- a/docs/undocumented.bmh
+++ b/docs/undocumented.bmh
@@ -18,7 +18,7 @@
  CSS HTML
 
  affine destructor multitexturing representable subclasses descender descenders grayscale kerning
- unhinted
+ unhinted no-parameter
  
  Sa Da Sc Dc 0xAARRGGBB # temporary until figure out what to do