Updated the fmt feature flag error message

[TheDan64]

No description provided.

[codecov-commenter]

Codecov Report

Merging #3586 (088d482) into master (4f579fa) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3586   +/-   ##
=======================================
  Coverage   61.56%   61.56%           
=======================================
  Files         427      427           
  Lines       71526    71526           
=======================================
+ Hits        44033    44035    +2     
+ Misses      27493    27491    -2     

Impacted Files	Coverage Δ
polars/polars-core/src/fmt.rs	31.81% <ø> (ø)
polars/polars-arrow/src/kernels/take.rs	68.14% <0.00%> (-0.25%)	⬇️
polars/polars-core/src/datatypes.rs	46.79% <0.00%> (-0.19%)	⬇️
polars/polars-core/src/series/mod.rs	52.73% <0.00%> (-0.16%)	⬇️
polars/polars-io/src/csv_core/buffer.rs	79.74% <0.00%> (+0.25%)	⬆️
...olars/polars-core/src/frame/groupby/into_groups.rs	55.72% <0.00%> (+0.60%)	⬆️
polars/polars-core/src/series/from.rs	69.13% <0.00%> (+0.61%)	⬆️

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