[doc] perlretut grammar about perl5 HOT 5 CLOSED

Instead of swapping the "and" for a comma,
Rephrasing of the parenthetical clause (as done in the pull request) seems to make the thought clearer.

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Sounds good; I will prepare a pull request

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Actually, looking deeper, I think having the parentheses is better.

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@khwilliamson, I think the author is asking here to "update" the and specifically.

without curly braces and XY are two hex digits

without curly braces, XY are two hex digits

@poti1, why not create a quick PR using GitHub's edit file feature?

https://github.com/Perl/perl5/edit/blead/pod/perlretut.pod

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That would be incorrect; it is stating two conditions, that no curly braces are used, and that it is followed by two hex digits. The presence of curly braces does not affect whether the digits are hex.

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