Fix typo

README.md

@@ -87,7 +87,7 @@ And that's also *all* this command does.
 Next, if you have also installed some modules, you can look around
 using `sfdoc`:
 
-    sfdoc --lsmods
+    sfdoc --lsmod
     sfdoc inigrep
 
 This is how you access documentation of modules available on the system.