Fix some spelling and format typo in api manual
Fix some spelling and format typo in api manual

1: Fix following spelling typo
   accomodate -> accommodate
   specifed -> specified

2: Remove extra space in table

3: Changed
   "Source/Destination IP address or prefix"
   to
   "Source/Destination IP address prefix"
   for source/destination_ip_prefix field.

4: Remove unnecessary tailing '/' in URLs

5: Rename DEL to DELETE because DEL is not a standard operation.

Change-Id: I5a242e4a964b2da5138893c89afb2c8275ca328c
Signed-off-by: Zhao Lei <aacdd228f50c574b28b524b23f12fb9d52d6e0e3@cn.fujitsu.com>

openstack/networking-sfc,openstack/networking-sfc