Fix Sharing app description

[nickvergessen]

@LukasReschke @MorrisJobke

Fix #3357

[mention-bot]

@nickvergessen, thanks for your PR! By analyzing the history of the files in this pull request, we identified @bartv2, @icewind1991 and @MTGap to be potential reviewers.

[codecov-io]

Codecov Report

Merging #3359 into master will increase coverage by -0.01%.

@@             Coverage Diff              @@
##             master    #3359      +/-   ##
============================================
- Coverage     53.99%   53.98%   -0.01%     
- Complexity        0        1       +1     
============================================
  Files          1303     1303              
  Lines         80377    80377              
  Branches       1253     1253              
============================================
- Hits          43397    43394       -3     
- Misses        36980    36983       +3

Impacted Files	Coverage Δ	Complexity Δ
apps/comments/lib/EventHandler.php	79.16% <ø> (-8.34%)	0% <ø> (ø)
lib/private/Files/Cache/Propagator.php	94.93% <ø> (-1.27%)	0% <ø> (ø)

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[MariusBluem]

👍

[MorrisJobke]

cc @karlitschek @nickvergessen I would like to see this backported.

[karlitschek]

please backport

[nickvergessen]

Backported to 11 and 10