doc: notes: split out options with negated forms

Split these out so that they are easier to search for.[1]

[1]: https://lore.kernel.org/git/xmqqcyct1mtq.fsf@gitster.g/

Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-notes.adoc

@@ -174,14 +174,16 @@ OPTIONS
 	Allow an empty note object to be stored. The default behavior is
 	to automatically remove empty notes.
 
-`--[no-]separator`::
 `--separator=<paragraph-break>`::
+`--separator`::
+`--no-separator`::
 	Specify a string used as a custom inter-paragraph separator
 	(a newline is added at the end as needed). If `--no-separator`, no
 	separators will be added between paragraphs.  Defaults to a blank
 	line.
 
-`--[no-]stripspace`::
+`--stripspace`::
+`--no-stripspace`::
 	Strip leading and trailing whitespace from the note message.
 	Also strip out empty lines other than a single line between
 	paragraphs. Lines starting with `#` will be stripped out