doc: go spec says grammar is "regular", but it is not regular in grammar sense #36037
Description
The doc/go_spec.html file in master, as of this filing (6fcc2d8), states that:
The grammar is compact and regular, allowing for easy analysis by automatic tools such as integrated development environments.
When speaking about grammars, regular has a very particular meaning. It describes a regular language. The go language grammar does not fall in this category.
https://en.wikipedia.org/wiki/Regular_grammar
It would be better to specify the subclass of context-free languages that the go grammar adheres to. I don't know which one it is, but it could be LALR(1), LL(1), etc. This will tell the programmer which tools can be used to generate a parser for go.