[3.11] gh-95913: Prepare remaining Whatsnew sections for editing (GH-98342) #98384
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Add line breaks & ref targets to Whatsnew to prepare for future changes
Use standard heading underbar symbols for H4 sections
Flatten Porting subsection; clarify scope of/link Python->CAPI sections
Move C API pending deprecations to C API section, to match the others
(cherry picked from commit 0a0c7e5)
Co-authored-by: C.A.M. Gerlach CAM.Gerlach@Gerlach.CAM