Update README.md related to ASR architecture

[m-koichi]

Related to #4845 (comment)

[codecov]

Codecov Report

Merging #4865 (86739f1) into master (15a2f0e) will increase coverage by 0.38%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4865      +/-   ##
==========================================
+ Coverage   78.37%   78.76%   +0.38%     
==========================================
  Files         571      571              
  Lines       51295    51322      +27     
==========================================
+ Hits        40203    40424     +221     
+ Misses      11092    10898     -194     

Flag	Coverage Δ
test_integration_espnet1	66.39% <ø> (ø)
test_integration_espnet2	48.33% <ø> (+<0.01%)	⬆️
test_python	68.16% <ø> (+0.60%)	⬆️
test_utils	23.34% <ø> (+0.26%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
espnet2/asr/state_spaces/cauchy.py	2.81% <0.00%> (-0.17%)	⬇️
espnet2/gan_svs/vits/vits.py	93.41% <0.00%> (+0.07%)	⬆️
espnet/nets/pytorch_backend/e2e_vc_transformer.py	86.72% <0.00%> (+0.11%)	⬆️
espnet/nets/pytorch_backend/e2e_asr_maskctc.py	91.85% <0.00%> (+0.12%)	⬆️
espnet/nets/pytorch_backend/e2e_vc_tacotron2.py	80.48% <0.00%> (+0.15%)	⬆️
espnet/nets/chainer_backend/e2e_asr_transformer.py	69.59% <0.00%> (+0.20%)	⬆️
espnet/nets/pytorch_backend/lm/seq_rnn.py	86.88% <0.00%> (+0.21%)	⬆️
espnet2/asr/state_spaces/s4.py	53.00% <0.00%> (+0.22%)	⬆️
espnet2/enh/layers/dnn_beamformer.py	97.74% <0.00%> (+0.56%)	⬆️
espnet2/train/gan_trainer.py	69.58% <0.00%> (+1.03%)	⬆️
... and 5 more

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