minor #17165 [Lock] Specify default ttl (mohamedGasmii)

This PR was merged into the 4.4 branch.

Discussion
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[Lock] Specify default ttl

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Commits
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3826710 [Lock] Specify default ttl

Author: xabbuh

components/lock.rst

@@ -145,7 +145,7 @@ job; if it's too long and the process crashes before calling the ``release()``
 method, the resource will stay locked until the timeout::
 
     // ...
-    // create an expiring lock that lasts 30 seconds
+    // create an expiring lock that lasts 30 seconds (default is 300.0)
     $lock = $factory->createLock('charts-generation', 30);
 
     if (!$lock->acquire()) {