fix: doc built-in-functions

[benjiqq]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2450 (14a018b) into master (59e1bdd) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2450      +/-   ##
==========================================
+ Coverage   84.64%   84.67%   +0.03%     
==========================================
  Files          94       94              
  Lines        9438     9438              
  Branches     2206     2206              
==========================================
+ Hits         7989     7992       +3     
+ Misses        939      937       -2     
+ Partials      510      509       -1     

Impacted Files	Coverage Δ
vyper/builtin_functions/functions.py	88.83% <0.00%> (+0.34%)	⬆️

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