SubmittingPatches: tags -> trailers

“Trailer” is the preferred nomenclature in this project.  Also add a
definite article where I think it makes sense.

As we can see the rest of the document already prefers this term.  This
just gets rid of the last stragglers.

Signed-off-by: Kristoffer Haugsbakk <[email protected]>
Signed-off-by: Taylor Blau <[email protected]>

Author: LemmingAvalanche

Documentation/SubmittingPatches

@@ -412,13 +412,13 @@ Also notice that a real name is used in the `Signed-off-by` trailer. Please
 don't hide your real name.
 
 [[commit-trailers]]
-If you like, you can put extra tags at the end:
+If you like, you can put extra trailers at the end:
 
 . `Reported-by:` is used to credit someone who found the bug that
   the patch attempts to fix.
 . `Acked-by:` says that the person who is more familiar with the area
   the patch attempts to modify liked the patch.
-. `Reviewed-by:`, unlike the other tags, can only be offered by the
+. `Reviewed-by:`, unlike the other trailers, can only be offered by the
   reviewers themselves when they are completely satisfied with the
   patch after a detailed analysis.
 . `Tested-by:` is used to indicate that the person applied the patch
@@ -436,7 +436,7 @@ While you can also create your own trailer if the situation warrants it, we
 encourage you to instead use one of the common trailers in this project
 highlighted above.
 
-Only capitalize the very first letter of tags, i.e. favor
+Only capitalize the very first letter of the trailer, i.e. favor
 "Signed-off-by" over "Signed-Off-By" and "Acked-by:" over "Acked-By".
 
 [[git-tools]]