* Add examples to YAMLSyntax; fix minor issues and improve wording
I added proper titles to "Flow Collections" and "Block Scalars", because these
are official YAML Terms, so people can find better help when having issues.
I changed the "ignored newlines" to "folded newlines" because I think ignoring
gives a wrong impression, especially since empty lines (more than one newline)
are not ignored and have a special meaning.
I added an example how to enforce a newline in a folded block scalar.
I fixed the list of characters that are allowed/not allowed in plain and
double quoted scalars.
I added the #yaml channel to the IRC link.
I added links to the YAML Specs. For completeness, I also included YAML 1.2,
although PyYAML and libyaml currently implement 1.1.
* Improve wording
* Add three more characters to forbidden first characters
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