Documentation updates:

- Try to explain better that werc expects Plan 9 tools in /usr/local/plan9/bin/
- Note possible bug.
- Other small doc changes.

etc/initrc

@@ -14,6 +14,9 @@ plan9port=$PLAN9
 # If you use 9base, it should point to your 9base root, try for example:
 #plan9port=/usr/lib/9base # This is the default 9base install path in Debian.
 
+# If rc is not installed as /usr/local/plan9/bin/rc you will also need to change
+# the #! line in bin/werc.rc!
+
 # Path, make sure the plan9port /bin directory is included before /bin
 # Keep '.' in path! It is needed.
 path=($plan9port/bin . ./bin ./bin/contrib /bin /usr/bin)