'dollar local labels' in GAS do not appear to be implemented

[Nicholas Clifton]

Hi Guys.

 >> Support for dollar labels is target dependent.
>
> https://sourceware.org/binutils/docs/as/Symbol-Names.html
>
> the intro section does note that it's machine dependent,

> guess we propagate that note down.

I am checking in the attached patch to update the documentation as follows:

   5.3 Symbol Names
   ================

[...]

   Symbol names do not start with a digit.  An exception to this rule
   is made for Local Labels.  See below.


[...]


   Dollar Local Labels
   -------------------

   On some targets 'as' also supports an even more local form of local
   labels called dollar labels.  These labels go out of scope (i.e., they

[...]


Cheers
   Nick

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