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runtime(doc): Clarify list-concatenation a bit more
Make doc list-concatenation more clear as for += and extend().
1. describe `+=` for list-concatenation more accurately
2. add `extend()` example for list-concatenation
3. Fix CI errors for missing helptags reference |+=|
closes: vim/vim#13983
c9c2e2d2ff
Co-authored-by: qeatzy <qeatzy@users.noreply.github.com>