kamailio-kemi-framework: docs for KSR.pv.getvn(...) and KSR.pv.getvs(...)

kamailio-kemi-framework/docs/kemi.md

@@ -473,7 +473,7 @@ The bool return code is expected to be evaluated as `true` or `false` inside the
 
 If a function has `void` as return type in the signature, the it doesn't return any value.
 
-Few functions may return a string value.
+Few functions may return a string value, for example in the `KSR.pv` submodule to get the value of pseudo-variables.
 
 The convention for the parameters in the signature of the functions is to enclose in double quotes if the parameter
 has a string type and no quotes if the parameter has integer type.

kamailio-kemi-framework/docs/kemimods.md

@@ -40,6 +40,32 @@ Example:
 KSR.dbg("avp is: " + KSR.pv.gete("$avp(x)") + "\n");
 ```
 
+### KSR.pv.getvn(...) ###
+
+`val KSR.pv.getvn(str "pvname", int vn)`
+
+Return the value of pseudo-variable `pvname` if it is different than `$null` or the parameter `vn`
+if the variable is having the `$null` value.
+
+Example:
+
+```
+KSR.dbg("avp is: " + KSR.pv.getvn("$avp(x)", 0) + "\n");
+```
+
+### KSR.pv.getvs(...) ###
+
+`val KSR.pv.getvs(str "pvname", int vn)`
+
+Return the value of pseudo-variable `pvname` if it is different than `$null` or the parameter `vs`
+if the variable is having the `$null` value.
+
+Example:
+
+```
+KSR.dbg("avp is: " + KSR.pv.getvs("$avp(x)", "foo") + "\n");
+```
+
 ### KSR.pv.getw(...) ###
 
 `val KSR.pv.getw("pvname")`