Update column-options, added "width" note
Update column-options, added "width" note

follow up from https://github.com/wenzhixin/bootstrap-table/issues/1291

I cleaned up the paragraph and added a short note as needs it here and/or in an example to make more obvious that "width" does not always stick around with many columns, though this can be seen in http://issues.wenzhixin.net.cn/bootstrap-table/#options/large-columns.html but a solution against that is not.

Can maybe be added in that example too, but the doco is higher visibility so would leave here too even if.
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