Clean up some reStructuredText formatting.

This primarily involves escaping[1] the pluralizing "s" character when
it immediately follows an inline literal.

Also, fix the Thrift IDL link (no trailing backslash allowed).

[1] http://docutils.sourceforge.net/docs/user/rst/quickref.html#escaping
avoid collisions between struct name and field name in generated code
codegen binary version in generated code, part 1
StructFieldDescriptor with structMeta accessor
bump spindle version
bump version, use 4.1 plugin
version number in generated code
generate StructFieldDescriptor
enum annotations part 2