paser-tools: doc clarifications
paser-tools: doc clarifications

Nothing in the docs said that `parser-tools/yacc' is for LALR grammars
--- although I guess that it implied for most reader by the name "yacc",
but it doesn't hurt to say so explicitly. Meanwhile,
`parser-tools/cfg-parser' is useful for non-ambigious (non-LALR) grammars.

Also, from the style guide:
 * Section Titles Should be In Titlecase, Like This
 * Don't start a setence with an uncapitalized identifier.

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