* doc/org-manual.org: Add target spec format for function and symbol
for headline and olp.
* etc/ORG-NEWS: Announce the updated options for
`org-capture-templates'.
* lisp/org-capture.el (org-capture-templates): Update customization
type for `file+headline', `file+olp', and `file+olp+datetree' targets,
and update docstring.
(org-capture-expand-headline): Define a new function that computes
headline string from target spec.
(org-capture-expand-olp): Define a new function that computes olp list
from target spec.
(org-capture-set-target-location): Use `org-capture-expand-headline'
to expand headline, and use `org-capture-expand-olp' to expand outline
path.
* testing/lisp/test-org-capture.el (test-org-capture/entry): Add tests
for at most three different kinds of target for `file+headline',
`file+olp', and `file+olp+datetree'.
(test-org-capture/org-capture-expand-olp): Add tests for
`org-capture-expand-olp'.
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