EUDC: Update save-query-as-kill name and docstring

EUDC: Update save-query-as-kill name and docstring

* lisp/net/eudc-vars.el (eudc-server): Fix quoting for checkdoc.
(eudc-expansion-save-query-as-kill): Rename from
`eudc-expansion-overwrites-query'.  Define obsolete variable
alias.  Update comment and documentation.
* lisp/net/eudc.el (eudc-expand-inline): Rename `replace' argument
to `save-query-as-kill'.  Update argument documentation.
* doc/misc/eudc.texi (Inline Query Expansion): Rename
`eudc-expand-inline' argument.
* etc/NEWS (EUDC): Document `eudc-expansion-overwrites-query'
rename to `eudc-expansion-save-query-as-kill'.