DOCS-15615 remove limitation (#135)

Author: Dave Cuthbert

source/reference/limitations.txt

@@ -46,7 +46,6 @@ General Limitations
 - If write blocking is disabled, the client must :ref:`prevent writes
   <c2c-api-start>` to the source cluster before starting the commit
   process.
-- Network compression is not supported.
 - :dbcommand:`applyOps` operations from the source cluster are not
   supported.
 - :ref:`system.* collections <metadata-system-collections>` are not