[alg.partition] Fix "true" that should be "false".

A misapplication of P3179R9.

Author: tkoeppe

source/algorithms.tex

@@ -9917,7 +9917,7 @@
   \tcode{i2} be the iterator in \range{first}{last}
   for which $E(\tcode{*i2})$ is \tcode{false}
   and there are exactly $K$ iterators \tcode{j} in \range{first}{\tcode{i2}}
-  for which $E(\tcode{*j})$ is \tcode{true},
+  for which $E(\tcode{*j})$ is \tcode{false},
   or \tcode{last} if no such iterator exists;
 \item
   $N$ be $\min(\tcode{i1 - first}, \ \tcode{i2 - first})$.