Add documentation and change the name of ion_dspmde

[lbibl]

Changes proposed in this PR:

• Added documentation for the formerly ion_dspmde_prop_pack.
• rename "dspmde" to "multi-component aqueous solution (MCAS)".

Legal Acknowledgement

By contributing to this software project, I agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the license terms described in the LICENSE.txt file at the top level of this directory.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[codecov]

Codecov Report

Merging #858 (cb25d4d) into main (80e27cd) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #858   +/-   ##
=======================================
  Coverage   95.41%   95.41%           
=======================================
  Files         261      261           
  Lines       25196    25196           
=======================================
  Hits        24042    24042           
  Misses       1154     1154           

Impacted Files	Coverage Δ
...owsheets/electrodialysis/electrodialysis_1stack.py	99.34% <100.00%> (ø)
...rtap/property_models/multicomp_aq_sol_prop_pack.py	92.30% <100.00%> (ø)

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[TimBartholomew]

LGTM

[srikanthallu]

LGTM

[lbibl]

Hi @bknueven , FYI it looks we pushed "merge main" at the same time a few min ago to address the conflicts. The latest commit is what I pushed and nothing really changed. It should be good to go after all checks. Thanks for merging this.