Gnulib manual corrections

[dietmar.schindler]

On 
https://www.gnu.org/software/gnulib/manual/html_node/Collating-Elements-vs_002e-Characters.html
 there are two inaccuracies:

1. "For example, the German collates as the collating element 's' followed by 
another collating element 's'." - Here the example character is simply missing; 
it should perhaps read:
   "For example, the German 'ß' (small sharp s) collates as the collating 
element 's' followed by another collating element 's'."

2. "For example, the Spanish 'll' collates after 'l' and before 'm'." - This 
was true until April 1994; see https://en.wikipedia.org/wiki/Ll#Spanish.

--
Best regards,
Dietmar Schindler
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