Update .direnv info with specific PATH_add example
Update .direnv info with specific PATH_add example

Adding `./bin` to `PATH` using `.direnv` can be problematic in Bash; see https://github.com/zimbatm/direnv/issues/133. Update to use `PATH_add` instead, which expands the full directory name.
smathy/spring,y-yagi/spring,maclover7/spring,mariusbutuc/spring,grosser/spring,slobodankovacevic/spring,rails/spring,universsky/spring-1,ypresto/spring