Fixes man page issues found by lintian. (hyphen-used-as-minus-sign and
one typo)

Index: gnudatalanguage/doc/gdl.1
===================================================================
--- gnudatalanguage.orig/doc/gdl.1	2012-06-28 01:26:34.000000000 +0200
+++ gnudatalanguage/doc/gdl.1	2012-06-29 17:29:47.000000000 +0200
@@ -3,22 +3,22 @@
 gdl \- GNU Data Language incremental compiler
 .SH SYNOPSIS
 .B gdl
-.RI [--help]
-.RI [-h]
-.RI [--version]
-.RI [-v]
-.RI [-V]
-.RI [[-]-quiet]
-.RI [-q]
+.RI [\-\-help]
+.RI [\-h]
+.RI [\-\-version]
+.RI [\-v]
+.RI [\-V]
+.RI [[\-]\-quiet]
+.RI [\-q]
 .RI [
--arg 
+\-arg 
 value 
 ]
 .RI [ 
--args ... 
+\-args ... 
 ]
 .RI [ 
--e statement
+\-e statement
 ]
 .RI [ 
 batch_file ... 
@@ -68,9 +68,9 @@
 .B \-e statement
 Execute given statement and exit (last occurance taken into account only, executed after startup file, may not be specified together with batch files)
 .TP
-The -demo, -em, -novm, -queue, -rt, -ulicense and -vm options are ignored for compatibility with IDL.
+The \-demo, \-em, \-novm, \-queue, \-rt, \-ulicense and \-vm options are ignored for compatibility with IDL.
 .TP
-A list of batch files to be executed before entering the interactive mode (but after executing a startup file, if specified) may be given when not using the -e option.
+A list of batch files to be executed before entering the interactive mode (but after executing a startup file, if specified) may be given when not using the \-e option.
 .SH FILES
 .TP
 .B $DATADIR/gnudatalanguage/lib/*.pro
@@ -99,7 +99,7 @@
 A directory in which temporary files may be created.
 .TP
 .B HOME, SHELL
-Variables influencing shell invokations from within GDL (SPAWN procedure and the $ interpreter command).
+Variables influencing shell invocations from within GDL (SPAWN procedure and the $ interpreter command).
 Value of HOME determines as well the location of the GDL history-file.
 .TP
 .B PATH
