vim-patch:187df69: runtime(doc): cross-link :| meaning :p and explain E749 (#33559)

E749 is given when :print (with any range) is issued on an empty buffer,
like the one you get with :new or :enew. Furthermore, due to Vi
compatibility :| is a synonym.

As a result, mappings intended to include a <bar> separator (esp. in the
case of boolean or "||") between commands can generate E749 on startup
when placed in a vimrc if the bars are not properly encoded or escaped.
[1]. Document this failure mode and synonym near the generated error,
and cross link with :help :bar. Note that one must read or scroll quite
a bit to find the mention of :| behaving like :print!

[1]: https://vi.stackexchange.com/q/46625/10604

closes: vim/vim#17173

https://github.com/vim/vim/commit/187df69fd1563535773b8ddb2de1b0f5dd3dd2e9

Co-authored-by: D. Ben Knoble <ben.knoble+github@gmail.com>

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