Docs still reference fasttext.build_vocab sentences parameter

[Jeff-Winchell]

Current version of Fasttext.build_vocab method has a first parameter with two possible names, neither of which is "sentences" despite that 2+ year-old (pre version 4) parameter name being listed on https://radimrehurek.com/gensim/models/fasttext.html

[gojomo]

Yep, see #3152. PRs that ensure the preferred, explicit 'corpus_iterable' & 'corpus_file' are used everywhere (while the 'sentences' doesn't break where it was working in any 4.x) – & docs match, showing 'sentences' as deprecated – would make sense to me.