Add grammar in docs for {f32,f64}::from_str, mention known bug.#56217

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bors merged 6 commits intorust-lang:masterfrom

frewsxcv:frewsxcv-float-parse

Jan 25, 2019

Commits on Nov 25, 2018

Add grammar for {f32,f64}::from_str, mention known bug.
frewsxcv
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Commits on Dec 3, 2018

Commits on Dec 22, 2018

Commits on Jan 23, 2019

reposition markdown hyperlink reference
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