doc: printk-formats: do not mention casts for u64/s64

Do not mention casts for u64/s64.  Complements commit 2a7930bd
("Documentation/printk-formats.txt: No casts needed for u64/s64").
Signed-off-by: NIlya Dryomov <ilya.dryomov@inktank.com>
Acked-by: NRandy Dunlap <rdunlap@infradead.org>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

Documentation/printk-formats.txt

@@ -199,11 +199,11 @@ struct va_format:
 	Do not use this feature without some mechanism to verify the
 	correctness of the format string and va_list arguments.
 
-u64 SHOULD be printed with %llu/%llx, (unsigned long long):
+u64 SHOULD be printed with %llu/%llx:
 
 	printk("%llu", u64_var);
 
-s64 SHOULD be printed with %lld/%llx, (long long):
+s64 SHOULD be printed with %lld/%llx:
 
 	printk("%lld", s64_var);