fix typo

+ other minor updates

Author: coke

doc/Language/variables.pod6

@@ -1447,10 +1447,10 @@ C<$*TZ> is a dynamic variable intended to contain an object with information
 about the system's local timezone.  It should numify to the number of
 B<seconds> from GMT.
 
-If not set explicitely, it contains just an integer value without any
+If not set explicitly, it contains just an integer value without any
 further information, set the first time C<$*TZ> is accessed.  Any
-Daylight-Saving-Time changes occurring during the duration of the
-process, will B<not> be seen in that case.
+daylight saving time changes occurring during the duration of the
+process will B<not> be seen in that case.
 
 X<|$*CWD>
 =head4 C<$*CWD>