* sed: improve description of -i option
The original description makes it sound like sed would wait for additional input while it actually just modifies the specified file in-place.
* Stylistic improvement to sed.md
Minor stylistic improvements to the in place flag.
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
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Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>