DOCSP-52699 Fixes typo in serverStatus (#13647)

Author: kennethdyer

content/manual/upcoming/source/includes/7.0-concurrent-transactions.rst

@@ -17,7 +17,7 @@ post-7.0 and for earlier releases:
      - A large number of queued operations that persists for a 
        prolonged period of time likely indicates an overload. 
 
-       A concurrent storage engine transaction (ticket) availibility of 
+       A concurrent storage engine transaction (ticket) availability of 
        0 for a prolonged period of time **does not** indicate an overload.
 
    * - 6.0 and earlier