remove unused file + small typo/style

[b-flo]

What?

• Remove normalization.py from asr_transducer/encoder/modules/
• Change asr_transducer/encoder/building.py docstring

Why?

• File is unused. It was moved to asr_transducer/encoder/ after a refactor but old file was not removed.
• Typos and style issue.

See also

Related to #5140

[codecov]

Codecov Report

Merging #5346 (05c5bc0) into master (47f989a) will decrease coverage by 6.31%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5346      +/-   ##
==========================================
- Coverage   76.59%   70.29%   -6.31%     
==========================================
  Files         672      670       -2     
  Lines       59912    59786     -126     
==========================================
- Hits        45892    42024    -3868     
- Misses      14020    17762    +3742     

Flag	Coverage Δ
test_configuration_espnet2	∅ <ø> (∅)
test_integration_espnet1	65.95% <ø> (+0.02%)	⬆️
test_integration_espnet2	49.24% <ø> (ø)
test_python_espnet1	?
test_python_espnet2	51.30% <ø> (-0.01%)	⬇️
test_utils	23.17% <ø> (ø)

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

Files Changed	Coverage Δ
espnet2/asr_transducer/encoder/building.py	100.00% <ø> (ø)

... and 116 files with indirect coverage changes

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