[Docs] Translate Japanese comments into English

[sotetsuk]

No description provided.

[codecov]

Codecov Report

Merging #1005 (3f892cb) into main (de0bb45) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1005   +/-   ##
=======================================
  Coverage   86.06%   86.06%           
=======================================
  Files          53       53           
  Lines        5897     5897           
=======================================
  Hits         5075     5075           
  Misses        822      822           

Files Changed	Coverage Δ
pgx/_src/chess_utils.py	100.00% <ø> (ø)
pgx/_src/gardner_chess_utils.py	100.00% <ø> (ø)
pgx/_src/shogi_utils.py	99.31% <ø> (ø)
pgx/bridge_bidding.py	82.42% <ø> (ø)
pgx/connect_four.py	97.61% <ø> (ø)
pgx/experimental/bridge_bidding.py	0.00% <ø> (ø)
pgx/go.py	94.81% <ø> (ø)
pgx/chess.py	99.49% <100.00%> (ø)
pgx/gardner_chess.py	99.30% <100.00%> (ø)
pgx/shogi.py	98.01% <100.00%> (ø)
... and 1 more