Documentation for content-search.php inclusion
Merge pull request #486 from swissspidy/issue-483

Improve documentation in search template to explain how to override content output for the file.
Fixes overflow issue when hidden content with the .screen-reader-text class is positioned hard right.
Merge pull request #492 from mor10/screen-reader-text_overflow

Fixes overflow issue on .screen-reader-text. See #484.