[3.12] Docs: Fix a misplaced statement in the document for `ServerProxy` (GH-130616) (GH-130639)

Docs: Fix a misplaced statement in the document for `ServerProxy` (GH-130616)

The sentence "If an HTTPS URL ..." explains what the parameter means,
so moved it to the paragraph explaining what the other parameters mean.
(cherry picked from commit b26286ca49d87ad8491e411f7b0283b0f15ad5be)

Co-authored-by: Yuki Kobayashi <drsuaimqjgar@gmail.com>