docs(popover): clarify Dynamic Content demo

[tarusin]

Separate options in description. The current demo has a description only for TemplateRef binding. I've split this demo into two demos and added description for Simple binding.

Closes #3834

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.

• read and followed the CONTRIBUTING.md guide.
• built and tested the changes locally.
• added/updated demos.

[codecov]

Codecov Report

Merging #3836 into development will decrease coverage by 0.03%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #3836      +/-   ##
===============================================
- Coverage        72.03%   71.99%   -0.04%     
===============================================
  Files              252      252              
  Lines             8159     8159              
  Branches          1552     1552              
===============================================
- Hits              5877     5874       -3     
- Misses            1859     1860       +1     
- Partials           423      425       +2

Impacted Files	Coverage Δ
src/chronos/i18n/it.ts	71.42% <0%> (-28.58%)	⬇️
src/chronos/i18n/pl.ts	72.22% <0%> (-2.78%)	⬇️

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[YevheniiaMazur]

Tested, looks good

[valorkin]

please split in 2 demos