add a example code to API doc property in process.md

[PoojaDurgad]

example code added to the process.setgroups() API
doc property in process.md

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

[codecov-io]

Codecov Report

Merging #35738 into master will increase coverage by 0.00%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #35738 +/- ##
=======================================
Coverage 96.40% 96.40% =======================================
Files 220 223 +3 Lines 73675 73685 +10 =======================================
+ Hits 71025 71035 +10 
Misses 2650 2650 

Impacted Files	Coverage Δ
lib/net.js	95.28% <0.00%> (-0.02%)	⬇️
lib/path/win32.js	100.00% <0.00%> (ø)
lib/path/posix.js	100.00% <0.00%> (ø)
lib/util/types.js	100.00% <0.00%> (ø)
lib/internal/modules/esm/translators.js	95.21% <0.00%> (+0.06%)	⬆️

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[Trott]

I notice that L2207 indicates the array can only contain integers, but the text on L2213 correctly says it can also contain strings (group names). Might be good to update L2207. I'm not sure how to specify "an array of integers and/or strings" but {integer[]|string[]} might be close enough. (To me, that says "an array of integers or an array of strings" but excludes "an array that contains both". Still, that's better than not mentioning strings at all.)

[aduh95]

Landed in fc3f41b