fix _set_role_admin (#1158)

docs/modules/ROOT/pages/access.adoc

@@ -376,7 +376,7 @@ This mechanism can be used to create complex permissioning structures resembling
 provides an easy way to manage simpler applications. `AccessControl` includes a special role with the role identifier
 of `0`, called `DEFAULT_ADMIN_ROLE`, which acts as the *default admin role for all roles*.
 An account with this role will be able to manage any other role, unless
-xref:api/access.adoc#AccessControlComponent-_set_role_admin[`_set_role_admin`] is used to select a new admin role.
+xref:api/access.adoc#AccessControlComponent-set_role_admin[`set_role_admin`] is used to select a new admin role.
 
 Let's take a look at the ERC20 token example, this time taking advantage of the default admin role: