rcal-846 Add mosaic info to the science products RTD page

[ddavis-stsci]

Resolves RCAL-846

Closes #1252

This PR adds a description of the i2d (mosaic) data to read-the-docs.

Checklist

• [x] added entry in CHANGES.rst under the corresponding subsection
• [N/A] updated relevant tests
• [x] updated relevant documentation
• [x] updated relevant milestone(s)
• [x] added relevant label(s)
• [N/A] ran regression tests, post a link to the Jenkins job below. How to run regression tests on a PR

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.85%. Comparing base (1aec135) to head (51ba23b). Report is 5 commits behind head on main.

:exclamation: Current head 51ba23b differs from pull request most recent head 7bf99f1

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1262 +/- ## ========================================== - Coverage 78.93% 78.85% -0.09% ========================================== Files 117 117 Lines 8086 8088 +2 ========================================== - Hits 6383 6378 -5 - Misses 1703 1710 +7 ``` | [Flag](https://app.codecov.io/gh/spacetelescope/romancal/pull/1262/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spacetelescope) | Coverage Δ | | *Carryforward flag | |---|---|---|---| | [nightly](https://app.codecov.io/gh/spacetelescope/romancal/pull/1262/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spacetelescope) | `62.84% <ø> (+0.06%)` | :arrow_up: | Carriedforward from [1aec135](https://app.codecov.io/gh/spacetelescope/romancal/commit/1aec135149bc96e7b8f7ef208dc3daa1f9139a9b?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spacetelescope) | *This pull request uses carry forward flags. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spacetelescope) to find out more.

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[schlafly]

Was this the number of input SCAs or exposures? If the latter, maybe the number of SCAs is >32, and this is the fact that we're not grouping? But yeah, I suspect a bug of some kind.

[ddavis-stsci]

8 detectors, the asn code looks for individual detector files that touch a skycell. In this case WFI01, WFI02, WFI10 & WFI11 for the given visit and skycell.

On 6/3/24 4:52 PM, Eddie Schlafly wrote:

Was this the number of input SCAs or exposures? If the latter, maybe the number of SCAs is >32, and this is the fact that we're not grouping? But yeah, I suspect a bug of some kind.

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