make header consistent

finanalyst · finanalyst · commit fe6a97633dd3 · 2022-01-01T12:29:09.000Z
diff --git a/doc/Language/filename-extensions.rakudoc b/doc/Language/filename-extensions.rakudoc
@@ -32,7 +32,7 @@ of the file.
 Early filesystems, the part of the operating system handling filenames, constrained filename extensions
 to three characters after the '.'. This is no longer a constraint.
 
-=head1 History and Extensions
+=head1 History and extensions
 
 The Raku language was for many years known as Perl 6, and filename extensions
 were adopted accordingly. Consequently, there is a best current practice and a previous best
