DOC: use anchor ref in what's new for excel style

[jnothman]

see #16062

[jorisvandenbossche]

Thanks!

[codecov]

Codecov Report

Merging #16068 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #16068      +/-   ##
==========================================
- Coverage   90.84%   90.82%   -0.03%     
==========================================
  Files         159      159              
  Lines       50791    50791              
==========================================
- Hits        46143    46132      -11     
- Misses       4648     4659      +11

Flag	Coverage Δ
#multiple	88.6% <ø> (-0.03%)	⬇️
#single	40.36% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/plotting/_converter.py	63.54% <0%> (-1.82%)	⬇️
pandas/core/common.py	91.03% <0%> (+0.34%)	⬆️

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