fixed a typo in README and in a function input argument #143

Job	Run time
docs_examples_latex_pdf (cvode)	2m 21s
docs_examples_sphinx_pdf (arkode)	1m 47s
docs_examples_latex_pdf (cvodes)	1m 27s
docs_examples_latex_pdf (ida)	1m 27s
docs_examples_latex_pdf (idas)	1m 26s
docs_examples_latex_pdf (kinsol)	1m 24s
docs_package_pdf (arkode)	3m 39s
docs_install_guide_pdf	1m 52s
docs_package_pdf (cvode)	3m 21s
docs_package_pdf (cvodes)	3m 42s
docs_package_pdf (ida)	2m 58s
docs_package_pdf (idas)	3m 33s
docs_package_pdf (kinsol)	2m 57s
	31m 54s

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