doc (INSTALL): minor make update

INSTALL

@@ -343,13 +343,29 @@ Example: make modules-list include_modules="tls" skip_modules="print"
 Clean:
 
 make clean   (clean the modules too)
-make proper  (clean also the dependencies and the config)
+make proper  (clean also the dependencies and the config, but not the module
+  list)
 make distclean (the same as proper)
-make mantainer-clean (clean everything, including make's config, saved 
+make maintainer-clean (clean everything, including make's config, saved 
   module list, auto generated files, tags, *.dbg a.s.o)
 make clean-all (clean all the modules in modules/*)
 make proper-all (like make proper but for all the  modules in modules/*)
 
+Config clean:
+
+make clean_cfg (cleans the compile config)
+make clean-modules-cfg (cleans the modules list)
+
+"Reduced" clean:
+
+make local-clean    (cleans only the core, no libs, utils or modules)
+make clean-modules  (like make clean, but cleans only the modules)
+make clean-libs     (like make clean, but cleans only the libs)
+make clean-utils    (like make clean, but cleans only the utils
+make proper-modules (like make proper, but only for modules)
+make proper-libs    (like make proper, but only for libs)
+make proper-utils   (like make proper, but only for utils)
+
 Compile:
 
 make proper