Document that ping_interval should be >= wait_timeout

[anarthal]

Fix defect in connection_pool docs

close #290

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.04%. Comparing base (eba723f) to head (f987fbf). Report is 1 commits behind head on develop.

Additional details and impacted files

[](https://app.codecov.io/gh/boostorg/mysql/pull/373?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg) ```diff @@ Coverage Diff @@ ## develop #373 +/- ## ======================================== Coverage 99.04% 99.04% ======================================== Files 143 143 Lines 7157 7157 ======================================== Hits 7089 7089 Misses 68 68 ``` | [Files with missing lines](https://app.codecov.io/gh/boostorg/mysql/pull/373?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg) | Coverage Δ | | |---|---|---| | [include/boost/mysql/connection\_pool.hpp](https://app.codecov.io/gh/boostorg/mysql/pull/373?src=pr&el=tree&filepath=include%2Fboost%2Fmysql%2Fconnection_pool.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg#diff-aW5jbHVkZS9ib29zdC9teXNxbC9jb25uZWN0aW9uX3Bvb2wuaHBw) | `100.00% <ø> (ø)` | | | [include/boost/mysql/pool\_params.hpp](https://app.codecov.io/gh/boostorg/mysql/pull/373?src=pr&el=tree&filepath=include%2Fboost%2Fmysql%2Fpool_params.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg#diff-aW5jbHVkZS9ib29zdC9teXNxbC9wb29sX3BhcmFtcy5ocHA=) | `100.00% <ø> (ø)` | | ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/boostorg/mysql/pull/373?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/boostorg/mysql/pull/373?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg). Last update [eba723f...f987fbf](https://app.codecov.io/gh/boostorg/mysql/pull/373?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg).