Improve doc

doc/sources/admin/exportedvars.rst

@@ -51,13 +51,20 @@ portal:
 -  macros are used to extend (or rewrite)
    :doc:`exported variables<exportedvars>`. A macro is stored as
    attributes: it can contain boolean results or any string
--  macros can also be used to import environment variables *(these
+-  macros can also be used for importing environment variables *(these
    variables are in CGI format)*. Example: ``$ENV{HTTP_COOKIE}``
 -  groups are stored as a string with values separated by ''; ''
-   (default values separator) in the special attribute ``groups``: it
-   contains the names of groups whose rules were returned true for the
+   (default multivalues separator) in the special attribute ``groups``: it
+   contains names of groups whose rules were returned true for the
    current user. For example:
 
+.. danger::
+
+    Macros can be used for rewriting or overloading exported variables
+    but it can lead to some side effects. Be aware of alphabetical order
+    and keep in mind that exported variables are set then macros and
+    groups are computed.
+
 .. code-block:: perl
 
    $groups = group3; admin

doc/sources/admin/portalcustom.rst

@@ -361,7 +361,7 @@ Password Policy
 -  **Minimal upper characters**: leave 0 to bypass the check
 -  **Minimal digit characters**: leave 0 to bypass the check
 -  **Minimal special characters**: leave 0 to bypass the check
--  **Allowed special characters**: set '__ALL__' value to allow ALL special characters. A blanck value forbids ALL special characters (Note that ``_`` is not a special character)
+-  **Allowed special characters**: set '__ALL__' value to allow ALL special characters. A blank value forbids ALL special characters (Note that ``_`` is not a special character)
 
 .. _portalcustom-other-parameters: