stdlib: fix some autocompletion bugs

[frazze-jobb]

• strip newlines after format_matches, we only want one
• find_type should recognize {type, any, []} as the any type
• functions with arity 0 and multiple other arities but without typespecs should output the function/0

[github-actions[bot]]

CT Test Results

       3 files     141 suites   1h 38m 49s :stopwatch: 3 062 tests 2 880 :heavy_check_mark: 181 :zzz: 1 :x: 3 555 runs  3 327 :heavy_check_mark: 227 :zzz: 1 :x:

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Results for commit c1b6d7f6.

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[garazdawi]

If I do:

erl -stdlib shell_expand_location above
1> esc<TAB>
modules
escript:
1> escript:

the only completion is printed when it should just complete on the same line. Does this PR fix that? (The problem is also there for when expand is below, but just results in a blank expand area).

[frazze-jobb]

nope, but I can add a fix for that