SF #998170, fix typo. Backport candidate

Doc/lib/liblocale.tex

@@ -86,7 +86,7 @@ locale.setlocale(locale.LC_ALL, '')
     \lineiii{}{\code{'positive_sign'}}
             {Symbol used to annotate a positive monetary value.}
     \lineiii{}{\code{'negative_sign'}}
-            {Symbol used to annotate a nnegative monetary value.}
+            {Symbol used to annotate a negative monetary value.}
     \lineiii{}{\code{'frac_digits'}}
             {Number of fractional digits used in local formatting
              of monetary values.}