Fix typo in docs

Author: vkarak

docs/manpage.rst

@@ -766,7 +766,7 @@ Miscellaneous options
    This option can also be set using the :envvar:`RFM_CONFIG_FILES` environment variable.
 
    In order to determine its final configuration, ReFrame first loads the builtin configuration file unconditionally and then starts looking for possible configuration file locations defined in the :envvar:`RFM_CONFIG_PATH` environment variable.
-   For each directory defined in the :envvar:`RFM_CONFIG_PATH`, ReFrame looks for a file named ``settings.py`` or ``setting.json`` inside it and loads it.
+   For each directory defined in the :envvar:`RFM_CONFIG_PATH`, ReFrame looks for a file named ``settings.py`` or ``settings.json`` inside it and loads it.
    If both a ``settings.py`` and a ``settings.json`` files are found, the Python configuration will be preferred.
    ReFrame, finally, processes any configuration files specified in the command line or in the :envvar:`RFM_CONFIG_FILES` environment variable.