Update comments in .hx files that mention Texinfo

Update the header comments in .hx files that mention STEXI/ETEXI
markup; this is now SRST/ERST as all these files have been
converted to rST.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200306171749.10756-3-peter.maydell@linaro.org
diff --git a/qemu-options.hx b/qemu-options.hx
index f9fefd4..1d8f852 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1,10 +1,10 @@
-HXCOMM Use DEFHEADING() to define headings in both help text and texi
-HXCOMM Text between STEXI and ETEXI are copied to texi version and
-HXCOMM discarded from C version
+HXCOMM Use DEFHEADING() to define headings in both help text and rST.
+HXCOMM Text between SRST and ERST is copied to the rST version and
+HXCOMM discarded from C version.
 HXCOMM DEF(option, HAS_ARG/0, opt_enum, opt_help, arch_mask) is used to
 HXCOMM construct option structures, enums and help message for specified
 HXCOMM architectures.
-HXCOMM HXCOMM can be used for comments, discarded from both texi and C
+HXCOMM HXCOMM can be used for comments, discarded from both rST and C.
 
 DEFHEADING(Standard options:)