start of adding deprecationwarning for certain low level commands

[AndrewAnnex]

updating a docstring also

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (0f43e79) 99.86% compared to head (7669c57) 99.86%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #476 +/- ## ======================================= Coverage 99.86% 99.86% ======================================= Files 13 13 Lines 15635 15636 +1 ======================================= + Hits 15614 15615 +1 Misses 21 21 ``` | [Files Changed](https://app.codecov.io/gh/AndrewAnnex/SpiceyPy/pull/476?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrew+Annex) | Coverage Δ | | |---|---|---| | [src/spiceypy/\_\_init\_\_.py](https://app.codecov.io/gh/AndrewAnnex/SpiceyPy/pull/476?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrew+Annex#diff-c3JjL3NwaWNleXB5L19faW5pdF9fLnB5) | `100.00% <100.00%> (ø)` | | | [src/spiceypy/spiceypy.py](https://app.codecov.io/gh/AndrewAnnex/SpiceyPy/pull/476?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrew+Annex#diff-c3JjL3NwaWNleXB5L3NwaWNleXB5LnB5) | `99.68% <100.00%> (+<0.01%)` | :arrow_up: |

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