fix manpage spelling error found by Lintian

docs/dosbox.1

@@ -111,7 +111,7 @@ You can specify this command more than once. In this case it will
 .RI " move to second " program " if the first one fails to start."
 .TP
 .BI \-opencaptures " program"
-.RI "calls " program " with as  first paramater the location of the captures folder."
+.RI "calls " program " with as  first parameter the location of the captures folder."
 .TP
 .B \-printconf
 prints the location of the default configuration file.
@@ -216,9 +216,9 @@ either to create a new configfile or languagefile in this mode.
 The configuration file controls various settings of 
 .BR dosbox ": The amount of emulated memory,"
 the emulated soundcards and many
-.RI "more things. It futher allows acces to " AUTOEXEC.BAT .
+.RI "more things. It further allows access to " AUTOEXEC.BAT .
 .LP
-The language file controls all visible ouput of the internal commands and
+The language file controls all visible output of the internal commands and
 the internal dos. 
 .RB "See the section " FILES " for more information."
 .TP 
@@ -335,7 +335,7 @@ gets saved/recorded !
 capacity, it will produce the same effect as slowing down the emulation.
 This maximum will vary from computer to computer, there is no standard.
 .SH "SYSTEM REQUIREMENTS"
-Fast machine. My guess would be pentium\-2 400+ to get decent emulation
+Fast machine. My guess would be Pentium\-2 400+ to get decent emulation
 of games written for an 286 machine.
 For protected mode games a 1 Ghz machine is recommended and don't expect
 them to run fast though!! Be sure to read the next section on how to speed