generate tables instead of manual entry

- make descriptions of table entries phrases instead of sentences;
lower case start, no ending period (not enforced, yet)

- add #Line markup to move one line descriptions to the #Method
body. Later, will generate tables like Member_Functions from this

- add #In markup to associate a #Method with a #Subtopic. Later, will
generate tables of related methods from this

- remove return type from operator overloads in tables

- add new colorTypes to examples that index into arrays of strings
to name them


Docs-Preview: https://skia.org/?cl=100422
TBR=caryclark@google.com
Bug: skia:6898
Change-Id: I8558048866369f419f1944832b99c05da3fd52bb
Reviewed-on: https://skia-review.googlesource.com/100422
Reviewed-by: Cary Clark <caryclark@skia.org>
Commit-Queue: Cary Clark <caryclark@skia.org>
35 files changed