mhd_str.c: fixed c/p error in comment
mhd_str.c: fixed c/p error in comment

maru/libmicrohttpd-http2,ghaderer/libmicrohttpd,maru/libmicrohttpd-http2,ghaderer/libmicrohttpd,ghaderer/libmicrohttpd,maru/libmicrohttpd-http2