modules: readme files regenerated - sipjson ... [skip ci]

src/modules/sipjson/README

@@ -93,6 +93,8 @@ Chapter 1. Admin Guide
             'opt' parameter cannot be empty, '0' can be given when only
             default attributes are wanted.
           + B - (uppercase B) SIP message body
+          + c - (lowercase c) CSeq attributes
+          + t - (lowercase t) To header attributes
      * ovar - name of the output pseduo-variable
 
    This function can be used from ANY_ROUTE.
@@ -105,6 +107,11 @@ sj_serialize("0B", "$var(json)");
 4. Output Samples
 
    The content of the output variable is a JSON. Next are some samples.
+   Note that the content might change with future development and this
+   example become outdated, simply print the document when you start
+   testing your config and match the name of the attribute with the name
+   of pseudo-variables to understand what values can be there. Unlike
+   pseudo-variables, the $null values might converted to empty strings.
 
    Example 1.2. sj_serialize output
 ...
@@ -129,6 +136,7 @@ ing
   "ua":"sipsak 0.9.7pre",
   "ci":"[email protected]",
   "rb":""
+  ...
 }
 ...
 # the sip message sent to Kamailio: