docs: Correct name for xen-command-line.pandoc

In the commit d661611d08 ("docs/markdown: Switch to using pandoc, and
fix underscore escaping"), the documentation suffix was changed from
".markdown" to ".pandoc"; however, the reference was missed to update.

This patch updates the documentation name to xen-command-line.pandoc.

Fixes: d661611d08 ("docs/markdown: Switch to using pandoc, and fix underscore escaping")
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

docs/features/sched_credit2.pandoc

@@ -27,7 +27,7 @@ different than `credit2`) parameter is passed to Xen via the
 bootloader.
 
 Other parameters are available for tuning the behavior of Credit2
-(see `docs/misc/xen-command-line.markdown` for a complete list and
+(see `docs/misc/xen-command-line.pandoc` for a complete list and
 for their meaning).
 
 Once the system is live, for creating a cpupool with Credit2 as

docs/misc/arm/big.LITTLE.txt

@@ -42,5 +42,5 @@ The following option runs one domain vcpu as big and one as LITTLE:
   cpus = ["0-3", "4-7"]
 
 
-[1] docs/misc/xen-command-line.markdown
+[1] docs/misc/xen-command-line.pandoc
 [2] docs/man/xl.cfg.pod.5

xen/common/Kconfig

@@ -440,7 +440,7 @@ config DOM0_MEM
 	  The specified string will be used for the dom0_mem parameter in
 	  case it was not specified on the command line.
 
-	  See docs/misc/xen-command-line.markdown for the supported syntax.
+	  See docs/misc/xen-command-line.pandoc for the supported syntax.
 
 	  Leave empty if you are not sure what to specify.