ABI: stable/sysfs-module: document version and srcversion

Changeset c988d2b2 ("[PATCH] modules: add version and srcversion to sysfs")
added version and srcversion ABI to modules. Document them.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/82bc7ebcc56c68c39b0e9de89cd0e023339d0597.1632750608.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/ABI/stable/sysfs-module

@@ -33,3 +33,15 @@ Description:
 		Note: If the module is built into the kernel, or if the
 		CONFIG_MODULE_UNLOAD kernel configuration value is not enabled,
 		this file will not be present.
+
+What:		/sys/module/<MODULENAME>/srcversion
+Date:		Jun 2005
+Description:
+		If the module source has MODULE_VERSION, this file will contain
+		the checksum of the the source code.
+
+What:		/sys/module/<MODULENAME>/version
+Date:		Jun 2005
+Description:
+		If the module source has MODULE_VERSION, this file will contain
+		the version of the source code.