Update documentation for event "opened"

[codecov[bot]]

Codecov Report

Merging #877 into development will decrease coverage by 6.99%. The diff coverage is n/a.

@@             Coverage Diff              @@
##           development     #877   +/-   ##
============================================
- Coverage        37.33%   30.33%   -7%     
============================================
  Files               11       11           
  Lines              450      445    -5     
  Branches            73       73           
============================================
- Hits               168      135   -33     
- Misses             282      309   +27     
- Partials             0        1    +1

Impacted Files	Coverage Δ
src/select/select.ts	18.78% <0%> (-8.93%)	:arrow_down:
src/select/select-pipes.ts	31.57% <0%> (-3.43%)	:arrow_down:
src/select/off-click.ts	70% <0%> (-2.73%)	:arrow_down:
src/select/select.module.ts	100% <0%> (ø)	:arrow_up:

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[tobias74]

Hmm.. I just chnaged the documentation, how could this impact on codecoverage?