Update ClipBam.scala

[yfarjoun]

fix documentation
-u is not supported by samtools sort

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.62%. Comparing base (8d31cf3) to head (8ce926d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #997   +/-   ##
=======================================
  Coverage   95.62%   95.62%           
=======================================
  Files         126      126           
  Lines        7364     7364           
  Branches      500      500           
=======================================
  Hits         7042     7042           
  Misses        322      322           

Flag	Coverage Δ
unittests	95.62% <ø> (ø)

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[nh13]

@yfarjoun don't forget to delete branches!