Update function call doc with example of not using decorator syntax.

[ekzhu]

Why are these changes needed?

Update function call doc with example of not using decorator syntax, as many users are not familiar with decorators.

Related issue number

#1213

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0790da0) 33.19% compared to head (251afc2) 33.19%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1441   +/-   ##
=======================================
  Coverage   33.19%   33.19%           
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  Files          41       41           
  Lines        4950     4950           
  Branches     1135     1135           
=======================================
  Hits         1643     1643           
  Misses       3177     3177           
  Partials      130      130           

Flag	Coverage Δ
unittests	33.15% <ø> (ø)

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[namanbarkiya]

how about adding a notebook example?.. can I add that?

[davorrunje]

@namanbarkiya there are three notebooks demonstrating how to register functions using decorators (one with currency calculator, one with sync and one with async example). It would be great if you could add an example of using decorators as functions to each of them.

[namanbarkiya]

@davorrunje so I should update the changes in all the 3 files, correct? (append the method in each notebook)

[ekzhu]

@davorrunje so I should update the changes in all the 3 files, correct? (append the method in each notebook)

yes, you can start a new PR for this

[davorrunje]

@namanbarkiya actually, I added another utility method and updated everything in #1443. There was another problem I was fixing and just added those few lines while I was at it anyway. Thanx for the help in any case 😃

[namanbarkiya]

No worries! I'll try resolving some other issues, hope I can contribute to this project! 😄