wrong-index-solution: update

[dveeden]

What is changed, added or deleted? (Required)

The wrong index solution doc only focuses on one possible reason for why a different index than expected might be chosen. This update tries to extend this and also reference other helpful resources.

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[dveeden]

Should we add something about Index Cardinality?

[mjonss]

LGTM, and I assume the referenced pages have examples and solutions to fix the issues, more than simply ANALYZE TABLE?

[ti-chi-bot]

@mjonss: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

LGTM, and I assume the referenced pages have examples and solutions to fix the issues, more than simply ANALYZE TABLE?

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[ti-chi-bot]

@qw4990: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

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