Remove double '.' at the end of a sentence.

Author: fluca1978

doc/Language/faq.pod6

@@ -195,7 +195,7 @@ run C<perl6 --stagestats -e "">
 =head2 What is Precompilation?
 
 When you load a module for the first time, Rakudo compiles it into bytecode,
-and both stores it on disk, and uses the compiled bytecode.. On subsequent
+and both stores it on disk, and uses the compiled bytecode. On subsequent
 loads, Rakudo prefers to load the bytecode, because that tends to be
 significantly faster.