[DOC] Need to improve doc for innodb_import_table_from_xtrabackup

[Nilnandan Joshi]

http://www.percona.com/doc/percona-xtrabackup/2.1/innobackupex/restoring_individual_tables_ibk.html

in which it said:

Note If you’re running Percona Server version older than 5.5.10-20.1,
variable *innodb_expand_import *should be used instead of
*innodb_import_table_from_xtrabackup*.

In usual English we say: you should A; but understand certain condition,
you should do B instead of A.

Through the entire page, I did not find that it asks to set
*innodb_import_table_from_xtrabackup*, but suddenly it says in an older
version, I should set *innodb_expand_import* instead of
*innodb_import_table_from_xtrabackup*. And furthermore this important
information (it won't work without the parameter set) is in a note section
instead of being highlighted.

I do not think this works well, as it took me a while to figure this out,
and I figured this out from another unrelated, obscure page. I think this
page could be written better, let me know if you agree.

[Valerii Kravchuk (valerii-kravchuk)]

Same applies to version 2.2, http://www.percona.com/doc/percona-xtrabackup/2.2/innobackupex/restoring_individual_tables_ibk.html says nothing about the innodb_import_table_from_xtrabackup variable directly.

[Valerii Kravchuk (valerii-kravchuk)]

Same for http://www.percona.com/doc/percona-xtrabackup/2.3/innobackupex/restoring_individual_tables_ibk.html

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PXB-1325