fix(docs): wrong GetOrigCaller usage reference

[leohhhn]

Description

Small fix for the docs.

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.11%. Comparing base (56f8357) to head (f256d24).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2659      +/-   ##
==========================================
- Coverage   60.11%   60.11%   -0.01%     
==========================================
  Files         560      560              
  Lines       74911    74911              
==========================================
- Hits        45036    45031       -5     
- Misses      26498    26502       +4     
- Partials     3377     3378       +1     

Flag	Coverage Δ
contribs/gnodev	60.58% <ø> (-0.82%)	⬇️
contribs/gnofaucet	14.46% <ø> (ø)
misc/genstd	80.54% <ø> (ø)
misc/logos	19.88% <ø> (ø)

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