Harmonization of core-coder functions - Word16 vs Word32 inputs

• Related issues: #2423 (closed)
• Requested reviewers:

Reason why this change is needed

• The names of functions accepting different data types are inconsistent.

Description of the change

• Differentiate functions accepting different data types in the appendix *_fx() vs. *_fx_32().

Affected operating points

• All is BE.

Closes #2423 (closed)