fix: correct example syntax for java client readme

[davidjgoss]

Problem

Errant parens in the example code makes it invalid - builder is a static method.

Solution

Remove the parens so the example is correct and matches the later one in the file.

One-line summary:
Correct example syntax for Java client README

Checklist

• You've signed-off your work
• Your changes are accompanied by tests (if relevant)
• Your change contains a small diff and is self-contained
• You've updated any relevant documentation (if relevant)
• You've included a one-line summary of your change for the CHANGELOG.md (Depending on the change, this may not be necessary).
• You've versioned your .sql database schema migration according to Flyway's naming convention (if relevant)
• You've included a header in any source code files (if relevant)

[boring-cyborg]

Thanks for opening your first pull request in the Marquez project! Please check out our contributing guidelines (https://github.com/MarquezProject/marquez/blob/main/CONTRIBUTING.md).

[codecov]

Codecov Report

Merging #2575 (dbca1da) into main (afd8adc) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #2575   +/-   ##
=========================================
  Coverage     83.26%   83.26%           
  Complexity     1286     1286           
=========================================
  Files           243      243           
  Lines          5934     5934           
  Branches        279      279           
=========================================
  Hits           4941     4941           
  Misses          846      846           
  Partials        147      147           

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[wslulciuc]

Ahh nice catch! 💯

[boring-cyborg]

Great job! Congrats on your first merged pull request in the Marquez project!