Path search functions should use the term _search_ instead of _find_

[adamlm]

This is probably a pedantic point, but it appears that searching is attempting to find something. This seems like a more appropriate term since we may not find a path.

Here are some supporting arguments:

• Semantic difference between "Find" and "Search"?
• Difference between "find" and "search"?
• General usages of the terms from the Standard library