Doc: Add explicit parameter list to sqlite3.connect

[erlend-aasland]

The sqlite3.connect module level function has a lot of parameters. Adding an explicit parameter list will add more structure to this function.

Discussed on Discourse, with a proof-of-concept given by CAM.

For now, I do not suggest to adapt all sqlite3 functions and methods to this doc style. That is, however, a possibility, but since most of the functions / methods accept only a very small number of parameters, I'm unsure of the gain.

[erlend-aasland]

FTR, other candidates for explicit parameter lists:

• sqlite3.Connection.create_*
• sqlite3.Connection.blobopen
• sqlite3.Connection.backup