docs: Expressions page does not contain Function Calls section

[mloskot]

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Overview of the Issue

This "For mode details" direction on Functions page leads to non-existent content:

Reproduction Steps

1. Go to https://developer.hashicorp.com/packer/docs/templates/hcl_templates/functions
2. Scroll to

   For more details on syntax, see Function Calls on the Expressions page.

3. Follow the "Function Calls" link
4. Observe:
   • it jumps to the top of the Expressions chapter
   • searching that page for function call or function calls yields nothing

Packer version

v1.9.x (latest)

Simplified Packer Template

N/A

Operating system and Environment details

N/A

Log Fragments and crash.log files

N/A

[lbajolet-hashicorp]

Thanks for reporting this @mloskot!

I'll open a PR to fix this ASAP.

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
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