[doc] fix typo in applications.md

[marwonline]

fix typo in applications.md

• [x] I adjusted the corresponding documentation for this change.
• [ ] I adjusted the values.yaml and the documentation for all values.

[codecov[bot]]

Codecov Report

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

Project coverage is 71.54%. Comparing base (5d2115b) to head (c1e916e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #658      +/-   ##
==========================================
- Coverage   71.72%   71.54%   -0.18%     
==========================================
  Files         442      442              
  Lines       65056    67222    +2166     
  Branches     2872     2872              
==========================================
+ Hits        46663    48097    +1434     
- Misses      18095    18825     +730     
- Partials      298      300       +2     

Flag	Coverage Δ
go	67.89% <ø> (-0.40%)	:arrow_down:
node-app	0.00% <ø> (ø)
node-azure	94.57% <ø> (ø)
node-core	42.10% <ø> (ø)
node-datadog	92.77% <ø> (ø)
node-elasticsearch	91.68% <ø> (ø)
node-flux	65.99% <ø> (ø)
node-github	98.30% <ø> (ø)
node-grafana	89.65% <ø> (ø)
node-harbor	94.88% <ø> (ø)
node-helm	99.15% <ø> (ø)
node-jaeger	90.96% <ø> (ø)
node-jira	95.66% <ø> (ø)
node-kiali	89.98% <ø> (ø)
node-klogs	93.41% <ø> (ø)
node-mongodb	95.89% <ø> (ø)
node-opsgenie	83.77% <ø> (ø)
node-prometheus	88.14% <ø> (ø)
node-rss	96.16% <ø> (ø)
node-runbooks	96.36% <ø> (ø)
node-signalsciences	97.47% <ø> (ø)
node-sonarqube	96.12% <ø> (ø)
node-sql	88.80% <ø> (ø)
node-techdocs	93.14% <ø> (ø)
node-velero	80.71% <ø> (ø)

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