Update production-notes.txt

Tweaked the ulimit text so that it's more accurate - 20k is below what we recommend in the ulimit page.

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1178 cleanup to language and adding an example
DOCS-1183: adding note about limit to numInitialChunks
spelling fix
build: cleaning up dynamic url build generators
adding common kerberos error messages to troubleshooting section
Update 2.4-upgrade.txt

Typos, and wanted to make sure it was clear that it was *always* okay to retry, but the upgrade may fail.

Signed-off-by: Sam Kleinman <samk@10gen.com>
new sasl parameters