lowercase letters for binaries

[Benno Schulenberg]

Looking for something that's easy to fix, I came across 
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=190551:
'egrep' and 'fgrep' are mistakenly spelled 'Egrep' and 'Fgrep' in 
the manpage.

The first part of that patch I've reproduced here, the second part 
("Grep" in the headers of the info page) isn't needed in my 
opinion, as those headers aren't part of the running text.

But the info page does contain a different mistake, spelling 'egrep' 
and 'fgrep' in all caps.  Attached patches correct these errors.

Also, in 'info grep usage', point 13 is... incomprehensible.

And point 14 would read better as: ''The word "grep" comes from ... 
uses the following syntax ... the screen:''

Benno

grep-man-lowercase.patch
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grep-info-lowercase.patch
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