Fix rustdoc comments for turn

[Subhra264]

This PR updates the rustdoc comments for the turn crate by removing Golang-specific comments.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (7c148de) 61.79% compared to head (45b776a) 61.80%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #487   +/-   ##
=======================================
  Coverage   61.79%   61.80%           
=======================================
  Files         530      530           
  Lines       48858    48860    +2     
  Branches    12332    12332           
=======================================
+ Hits        30193    30197    +4     
- Misses       9503     9504    +1     
+ Partials     9162     9159    -3     

Files Changed	Coverage Δ
turn/src/allocation/permission.rs	69.44% <ø> (ø)
turn/src/client/permission.rs	73.52% <ø> (ø)
turn/src/client/transaction.rs	65.10% <ø> (ø)
turn/src/relay/relay_none.rs	64.70% <ø> (ø)
turn/src/relay/relay_range.rs	0.00% <ø> (ø)
turn/src/relay/relay_static.rs	61.11% <ø> (ø)
turn/src/server/config.rs	80.00% <ø> (ø)

... and 9 files with indirect coverage changes

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