fix minor markup error that introduced extra punctuation

Doc/lib/libcsv.tex

@@ -78,8 +78,7 @@ introduce spurious characters into quoted fields, with no way for the user
 to control that behavior. The previous behavior caused considerable
 problems, particularly on platforms that did not use the unix line ending
 conventions, or with files that originated on those platforms - users were
-finding mysterious newlines where they didn't expect them.
-]{2.5}
+finding mysterious newlines where they didn't expect them]{2.5}
 
 \end{funcdesc}