[PATCH] Document mounting of binfmt_misc

Patch by Ivan Gyurdiev.

Documentation/binfmt_misc.txt

@@ -11,6 +11,9 @@ at the beginning of the file with a magic byte sequence (masking out specified
 bits) you have supplied. Binfmt_misc can also recognise a filename extension
 aka '.com' or '.exe'.
 
+First you must mount binfmt_misc:
+	mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc 
+
 To actually register a new binary type, you have to set up a string looking like
 :name:type:offset:magic:mask:interpreter: (where you can choose the ':' upon
 your needs) and echo it to /proc/sys/fs/binfmt_misc/register.

fs/Kconfig.binfmt

@@ -111,6 +111,9 @@ config BINFMT_MISC
 	  feature, and <file:Documentation/java.txt> for information about how
 	  to include Java support.
 
+          To use binfmt_misc, you will need to mount it:
+		mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
+
 	  You may say M here for module support and later load the module when
 	  you have use for it; the module is called binfmt_misc. If you
 	  don't know what to answer at this point, say Y.