doc/develop/sending_patches.rst: Reword where our git tree is slightly

doc/develop/sending_patches.rst: Reword where our git tree is slightly

We shouldn't have had the link to our git tree be contained within "``"
as that meant that it did not work as a link, so remove those. And
rather than make this a link plus text, keep this as a link within the
text for overall clarity.

Suggested-by: Quentin Schulz <[email protected]>
Reviewed-by: Neil Armstrong <[email protected]>
Reviewed-by: Quentin Schulz <[email protected]>
Signed-off-by: Tom Rini <[email protected]>