add placeholder to text box in editor L224

[samarakoon-ryan]

Fixes #8180 (<=== Add issue number here)

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[codecov]

Codecov Report

Merging #8181 into main will not change coverage.
The diff coverage is 82.35%.

@@           Coverage Diff           @@
##             main    #8181   +/-   ##
=======================================
  Coverage   81.69%   81.69%           
=======================================
  Files         100      100           
  Lines        5846     5846           
=======================================
  Hits         4776     4776           
  Misses       1070     1070           

Impacted Files	Coverage Δ
app/controllers/home_controller.rb	98.38% <ø> (ø)
app/models/concerns/statistics.rb	96.72% <ø> (ø)
app/controllers/spam2_controller.rb	75.59% <72.72%> (ø)
app/controllers/stats_controller.rb	73.62% <100.00%> (ø)
app/models/tag.rb	97.50% <100.00%> (ø)
app/models/user.rb	87.68% <100.00%> (ø)

[gitpod-io]

[sagarpreet-chadha]

Ah travis! Tests failing seems to be unrelated to this PR, closing and opening again

[gitpod-io]

[sagarpreet-chadha]

Awesome 🎉 💯
Thanks for contibuting!!!

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