Update (logical and textual) definitions salivary gland cell types with information about function

[dosumis]

See #2081 (comment) for details.

e.g. https://www.perplexity.ai/search/f5e5f8a6-cf6e-4b67-b28b-320173bc0725?s=c

Has details of myoepithelial and duct cell function

"The salivary glands are made up of lobules, with each lobule containing many secretory acinar cells that form rounded secretory units with a central duct 1 . Acinar cells initially produce an isotonic, plasma-like fluid that is further modified by duct cells through the reabsorption of most of the NaCl and secretion of KHCO3 2 . Due to the ducts being relatively impermeable to water, the final saliva is hypotonic 2. Acinar cells are surrounded by myoepithelial cells, which display 4 to 8 processes that wrap around the acini and intercalated ducts 4. These myoepithelial cells rhythmically contract to squeeze saliva from the acinar units through the duct system and release it into the oral cavity"

(All LLM outputs should of course be carefully validated against the lit)

[github-actions]

This issue has not seen any activity in the past 6 months; it will be closed automatically in one year from now if no action is taken.