corrected typo in docblock, and exception message changed exception message for max life of key to utilize same constant as the test
corrected typo in docblock, and exception message
changed exception message for max life of key to utilize same constant as the test

Shumkov/Rediska,webonyx/Rediska,r-kovalenko/Rediska,r-kovalenko/Rediska,Shumkov/Rediska,AlphaStaxLLC/Rediska,AlphaStaxLLC/Rediska