doc-fix: remove out-of-date info about inflation flavor character strings

[hkershaw-brown]

Description:

• remove out-of-date info about inflation flavor character strings
• link to inflation page rather than "program filter" which does not have any inflation info.
• added a target to the inflation section for linking

Fixes issue

fixes #694

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Documentation changes needed?

• My change requires a change to the documentation.
  • I have updated the documentation accordingly.

Tests

Built documentation locally

Checklist for merging

• Updated changelog entry
• Documentation updated
• Update conf.py

Checklist for release

• Merge into main
• Create release from the main branch with appropriate tag
• Delete feature-branch

Testing Datasets

• Dataset needed for testing available upon request
• Dataset download instructions included
• No dataset needed

[mjs2369]

DART/assimilation_code/modules/assimilation/filter_mod.rst

Lines 96 to 97 in d4d8d11

	The inflation control variables are all dimensioned 2, the first value controls the
	prior inflation and the second controls the posterior inflation.

duplicate info that's in the table at line 273

[mjs2369]

DART/assimilation_code/modules/assimilation/filter_mod.rst

Lines 7 to 8 in d4d8d11

	Main module for driving ensemble filter assimilations. Used by filter.f90, perfect_model_obs.f90, model_mod_check.f90,
	and a variety of test programs. See the :doc:`../../programs/filter/filter` for a general description of filter

Think it's more useful here to use the program names, i.e:
"Used by the filter, perfect_model_obs, and model_mod_check programs, as well as a variety of test programs."

[mjs2369]

DART/assimilation_code/modules/assimilation/filter_mod.rst

Line 466 in d4d8d11

| filter_main | inf_flavor= ### Must be 0, 2, 3. | Observation Inflation is no longer supported (i.e flavor 1). |

Don't think this is true that the only valid options are 0, 2, and 3? And in the inflation.rst doc it says otherwise:

DART/guide/inflation.rst

Lines 47 to 57 in d4d8d11

	``&filter_nml :: inf_flavor``
	*valid values:*\ 0, 2, 3, 4, 5
	Set the type of Prior and Posterior inflation applied to the state vector. Values mean:
	- **0:** No inflation (Prior and/or Posterior) and all other inflation variables are ignored
	- [**1:** Deprecated: Observation space inflation]
	- **2:** Spatially-varying state space inflation (gaussian)
	- **3:** Spatially-uniform state space inflation (gaussian)
	- **4:** Relaxation To Prior Spread (Posterior inflation only)
	- **5:** Enhanced Spatially-varying state space inflation (inverse gamma)

[hkershaw-brown]

DART/assimilation_code/modules/assimilation/filter_mod.rst

Lines 96 to 97 in d4d8d11

	The inflation control variables are all dimensioned 2, the first value controls the
	prior inflation and the second controls the posterior inflation.

duplicate info that's in the table at line 273

I think the intent of this is to stress the inflation options have a prior and posterior. If someone does not bother to read this whole table, then this gives the "Particular options to be aware of".

[hkershaw-brown]

0e04d67

fixed in 0e04d67

[hkershaw-brown]

DART/assimilation_code/modules/assimilation/filter_mod.rst

Lines 7 to 8 in d4d8d11

	Main module for driving ensemble filter assimilations. Used by filter.f90, perfect_model_obs.f90, model_mod_check.f90,
	and a variety of test programs. See the :doc:`../../programs/filter/filter` for a general description of filter

Think it's more useful here to use the program names, i.e: "Used by the filter, perfect_model_obs, and model_mod_check programs, as well as a variety of test programs."

I could see either way, the .f90 is which file has the "use filter_mod". I'd say leave as is since this pull request is to fix the inflation options docs.

[mjs2369]

Yep, that all makes sense to me. Ready to go into main then.