Add documentation for the nextSearchTerm function
Updated docs for `select2-clearing` event.
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3.4.3 release
remove incorrect warning. fixes #1730
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Documentation of select2-removing event feature.

Addition of documentation highlights the new event's purpose and usage.
Code has been added to the "Events Log" section of the documentation to
illustrate usage of the event in practice.
3.4.4 release
switch to 3.4.4 scripts
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release 3.4.5
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remove unreleased warning
add unreleased comment to portion that needs to be stripped when releasing
verbiage describe how to use id property with ajax calls.

In reference to issue #852
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Enable nextSearchTerm function for multiple select

This closes #2015.  Documentation only added to select2-latest.html as the
function is not available in Select2 3.4.5.

Signed-off-by: Kevin Brown <kbrown@rediker.com>