docs/specs/vmw_pvscsi-spec: Convert to rST

Convert the docs/specs/vmw_pvscsi-spec.txt file to rST format.
This conversion includes some minor wordsmithing of the text
to fix some grammar nits.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 20230927151205.70930-2-peter.maydell@linaro.org
diff --git a/MAINTAINERS b/MAINTAINERS
index 018ed62..73ec940 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2350,6 +2350,7 @@
 F: hw/net/vmxnet*
 F: hw/scsi/vmw_pvscsi*
 F: tests/qtest/vmxnet3-test.c
+F: docs/specs/vwm_pvscsi-spec.rst
 
 Rocker
 M: Jiri Pirko <jiri@resnulli.us>