[yocto] [yocto-docs][PATCH] ref-manual: fix example of setting root password using extrausers

[Paul Eggleton]

We need to use usermod here not useradd.

Signed-off-by: Paul Eggleton <paul.eggleton at linux.intel.com>
---
 documentation/ref-manual/ref-classes.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index d482ca0..253079d 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -860,7 +860,7 @@
         <literallayout class='monospaced'>
      inherit extrausers
      EXTRA_USERS_PARAMS = "\
-         useradd -P 1876*18 root; \
+         usermod -P 1876*18 root; \
          "
         </literallayout>
     </para>
-- 
2.1.0