pgsql: Update comments in find_typedef.

Update comments in find_typedef.

These comments don't seem to have been touched in a long time. Make them
describe the current implementation rather than what was here last century,
and be a bit more explicit about the unreferenced-typedefs issue.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/7aa8d9e56c18b1df9d924f144c06d921131a137e

Modified Files
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src/tools/find_typedef | 37 ++++++++++++++-----------------------
1 file changed, 14 insertions(+), 23 deletions(-)

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