Thickener & Dewatering Unit Model Documentation

[MarcusHolly]

Summary/Motivation:

Adds documentation for the thickener and dewatering unit models, both of which are based off the IDAES separator

Changes proposed in this PR:

• Adds unit model documentation

Legal Acknowledgement

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1. I agree my contributions are submitted under the license terms described in the LICENSE.txt file at the top level of this directory.
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[codecov]

Codecov Report

Merging #1017 (94ac7c6) into main (33343a5) will not change coverage.
The diff coverage is n/a.

❗ Current head 94ac7c6 differs from pull request most recent head a19904a. Consider uploading reports for the commit a19904a to get more accurate results

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  Hits        27389    27389           
  Misses       1194     1194           

[luohezhiming]

Looks good to me. I find that both units are only applicable to ASM1, that means once we move to ASM2d system, we need to consider to upgrate these two units, and it will need more work and documentation updates.

[luohezhiming]

Looks good to me. I find that both units are only applicable to ASM1, that means once we move to ASM2d system, we need to consider to upgrate these two units, and it will need more work and documentation updates.

[luohezhiming]

Looks good to me. I find that both units are only applicable to ASM1, that means once we move to ASM2d system, we need to consider to upgrate these two units, and it will need more work and documentation updates.