Fix: spelling of occurred in API.md

[mcbbugu]

Fixes a clear misspelling in API.md: occured → occurred (Events consistency section).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.25%. Comparing base (f703cc5) to head (faed4ff).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1559      +/-   ##
==========================================
- Coverage   78.41%   78.25%   -0.16%     
==========================================
  Files          91       91              
  Lines       15907    15907              
  Branches     1547     1544       -3     
==========================================
- Hits        12473    12448      -25     
- Misses       3410     3436      +26     
+ Partials       24       23       -1     

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[egekorkan]

@mcbbugu thanks! For all contributions to Thingweb repositories, you need to sign the ECA of Eclipse for "legal reasons". Could you do that and force push?