[Patch] LangRef.rst: Minor typo and whitespace fixes

[Débora Setton Sanches]

Hi,

While I was reading the IR documentation the other day, I took note of a
few small typos and grouped them in the patch that is attached.

It's really simple stuff, but I think they improve the text nonetheless,
so... Here you go! :)

Thanks,

Débora.
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