MAINT: Update comment

[j-t-1]

JBIG2Decode is now implemented, so comment was outdated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.71%. Comparing base (05300d5) to head (d10bda5).
Report is 1 commits behind head on main.

Additional details and impacted files

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  Coverage   96.71%   96.71%           
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  Files          53       53           
  Lines        9029     9029           
  Branches     1674     1674           
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  Hits         8732     8732           
  Misses        177      177           
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[pubpub-zz]

jbig2dec is not available in all environments, Is it?

[stefan6419846]

In theory, jbig2dec should be available in all environments. We just do not test it everywhere and it might be more complicated to get it running.

[j-t-1]

pypdf/docs/user/installation.md

Lines 51 to 57 in 05300d5

	For JBIG2 support, you need to install a global OS-level package as well:
	[`jbig2dec`](https://github.com/ArtifexSoftware/jbig2dec) The installation procedure
	depends on our operating system. For Ubuntu, just use the following for example:
	```
	sudo apt-get install jbig2dec
	```

@pubpub-zz I didn't know this.

# Use of _data to prevent errors on non-decoded streams such as JBIG2 when its optional OS-level package has not been installed?