doc/API/README.pod: change marpaESLIFReaderCallbackp to readerCallbackp [ci skip]
doc/API/README.pod: change marpaESLIFReaderCallbackp to readerCallbackp [ci skip]

jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF