Adjust error message

Signed-off-by: Cristian Le <git@lecris.dev>

Author: LecrisUT

tmt/libraries/beakerlib.py

@@ -121,8 +121,8 @@ def __init__(
                 # name of the repo used in `rlImport`.
                 if not identifier.nick:
                     raise tmt.utils.SpecificationError(
-                        "Need either 'url' fetch a remote beakerlib library, "
-                        "or 'path' to use a local filesystem library"
+                        "Need either 'url' to fetch a remote beakerlib library, "
+                        "or 'path' to use a local filesystem library, "
                         "or 'nick' to use the discovered tmt tree as the library."
                     )
                 # FIXME: it seems self.parent is always a `DiscoverFmf`?