* lisp/isearch.el (isearch-query-replace): Add " symbol" and other

* lisp/isearch.el (isearch-query-replace): Add " symbol" and other
possible search modes from `isearch-message-prefix' to the prompt.
(isearch-occur): Use `with-isearch-suspended' to not exit Isearch
when reading a regexp to collect.

* lisp/replace.el (perform-replace): Display "symbol " and other search
modes from `isearch-message-prefix' in the *Help* buffer.