Doc/components: Updare refresh.sh to show usage examples

This commit makes it clear how to use the refresh.sh script to
update board configs showing differents usages cenarios.

Signed-off-by: Alan C. Assis <acassis@gmail.com>

Documentation/components/tools/index.rst

@@ -877,7 +877,7 @@ Help is also available::
     $ tools/refresh.sh --help
     tools/refresh.sh is a tool for refreshing board configurations
 
-USAGE: ``./refresh.sh [options] <board>/<config>+``
+USAGE: ``./refresh.sh [options] <arch>|<chip>|<board>:<config>+``
 
 Where [options] include::
 
@@ -930,6 +930,28 @@ The steps to refresh the file taken by refresh.sh are:
    refresh.sh will prompt you first to avoid overwriting the
    defconfig file with changes that you may not want.
 
+Usage examples:
+
+Update all boards without verbose output::
+
+       $ ./tools/refresh.sh --silent --defaults all
+
+Update all boards and configs from `arm` architecture::
+
+       $ ./tools/refresh.sh --silent arch:arm
+
+Update all boards from `stm32f7` chip family::
+
+       $ ./tools/refresh.sh --silent chip:stm32f7
+
+Update all configs from `stm32f103-minimum` board::
+
+       $ ./tools/refresh.sh --silent board:stm32f103-minimum
+
+Update only the `nsh` config from stm32f103-minimum board::
+
+       $ ./tools/refresh.sh --silent stm32f103-minimum:nsh
+
 rmcr.c
 ------