Typo in file documentation for lib/bats/helpers

[marascio]

The top level file comment mentions:

#   . "path/to/bats/helpers"
#   set_bats_suite_name "${BASH_SOURCE[0]%/*}"
#   remove_bats_test_dirs

It should be set_bats_test_suite_name rather than set_bats_suite_name.