doc: there is no right shift for integer bitmasks

[catenacyber]

Link to redmine ticket: https://redmine.openinfosecfoundation.org/issues/6628

Describe changes:

• doc: there is no right shift for integer bitmasks

cc @zoomequipd

Follow up on #10246 to add this precision

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (244a35d) 73.31% compared to head (3e88302) 82.31%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #10282       +/-   ##
===========================================
+ Coverage   73.31%   82.31%    +9.00%     
===========================================
  Files         895      978       +83     
  Lines      148215   272029   +123814     
===========================================
+ Hits       108666   223929   +115263     
- Misses      39549    48100     +8551     

Flag	Coverage Δ
fuzzcorpus	63.47% <ø> (-0.01%)	:arrow_down:
suricata-verify	61.48% <ø> (-0.04%)	:arrow_down:
unittests	62.85% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

[suricata-qa]

ERROR:

ERROR: QA failed on build_asan.

Pipeline 18597

[suricata-qa]

Information:

ERROR: QA failed on SURI_TLPW2_autofp_suri_time.

field	baseline	test	%
	SURI_TLPW2_autofp_stats_chk
.uptime	101	111	109.9%

Pipeline 18707

[catenacyber]

Replaced by https://github.com/OISF/suricata/pull/10501