fix(doc): fix two typos

[fistach]

PR Checklist

Before creating new PR, please take a look at checklist below to make sure that you've done everything that needs to be done before we can merge it.

• [ X ] read and followed the CONTRIBUTING.md guide.
• built and tested the changes locally.
• added/updated tests.
• added/updated API documentation.
• added/updated demos.

[codecov]

Codecov Report

Merging #5244 into development will increase coverage by 0.47%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #5244      +/-   ##
===============================================
+ Coverage        51.04%   51.51%   +0.47%     
===============================================
  Files                3        3              
  Lines               96       99       +3     
  Branches            17       17              
===============================================
+ Hits                49       51       +2     
- Misses              37       38       +1     
  Partials            10       10

Impacted Files	Coverage Δ
demo/src/app/app.component.ts	40.81% <0%> (+1.68%)	⬆️

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