Javadoc examples in Atomic.java and RtSttc.java call non-existent Locks#lock(String)

[bibonix]

The class-level Javadoc examples in two files call Locks#lock(String), but that method does not exist on the Locks interface. The interface only declares exists(String) and get(String) (src/main/java/co/stateful/Locks.java:24,32), so the examples will not compile against the current API.

The offending snippets are in src/main/java/co/stateful/Atomic.java:31-33:

Lock lock = new RtSttc(new URN("urn:github:12345"), "token")
  .locks().lock("test");

and in src/main/java/co/stateful/RtSttc.java:33-35:

Lock lock = new RtSttc(
  new URN("urn:github:12345"), "token"
).locks().lock("test");

Both fail at .locks().lock("test") because RtSttc#locks() returns a Locks, and Locks exposes Lock get(String) to look up a lock by name.

Proposed fix: replace .locks().lock("test") with .locks().get("test") in both class-level Javadocs so the example matches the actual API.

[bibonix]

@yegor256 happy to clarify any of this or split the fix across the two files if you prefer separate patches.