API spec changes for PSTN Dialout for Rooms (#25451)

* Changes for PSTN dialout review

* Adding examples

* Modifying Examples jsons

* Adding version in Readme.md

* correcting version in comment

* adding Dialout to words

* nit

* Resolving review comments

* nits

* renaming enablePstnDialout to enablePstnDialOut

* Changing name from enablePstnDialOut to pstnDialOutEnabled as per review feedback

Author: shwali-msft

custom-words.txt

@@ -3737,4 +3737,5 @@ ulimits
 vnetblock
 usedCPUMHz
 totalCPUMHz
-docon
+docon
+DialOut