Clean up comments.

build/proto

@@ -1,9 +1,9 @@
 # Prototype file for PDP-7 Unix filesystem layout
 #
 # Entries are one of:
-#    filename f[r-][w-][r-][r-] uid local_file_to_insert
-#    dirname  d[r-][w-][r-][r-] uid [inumber]
-#    device   i[r-][w-][r-][r-] uid inumber
+#    filename f[r-][w-][r-][w-] uid local_file_to_insert
+#    dirname  d[r-][w-][r-][w-] uid [inumber]
+#    device   i[r-][w-][r-][w-] uid inumber
 #    link     l---- inumber
 #
 # The top directory's name is ignored
@@ -37,8 +37,8 @@ dd 	         drw-- -1 2
     mv       frwr- -1 ../bin/mv
     stat     frwr- -1 ../bin/stat
     ken      drwr- 10
-        system l---- 3
-        $
+      system l----  3
+      $
     dmr      drwr- 12
-        system l---- 3
-        $
+      system l----  3
+      $