Add missing doc of the `exact_text` option (#2202)
Add missing doc of the `exact_text` option (#2202)

* Add missing doc of the `exact_text` option

For the default value, see below:
https://github.com/teamcapybara/capybara/blob/101bb45ad674b1827fc43c625d8640447d0819cc/lib/capybara.rb#L490 [ci skip]
jnicklas/capybara,teamcapybara/capybara,jnicklas/capybara,jnicklas/capybara,teamcapybara/capybara,teamcapybara/capybara