tweaks: fiddle with some wordings in the texinfo document

Also, add two cross references: one in words, and one with a link.

doc/nano.texi

@@ -97,26 +97,24 @@ The usual way to invoke @code{nano} is:
 @code{nano [FILE]}
 @end quotation
 
-But it is also possible to specify one or more options, and to edit
-several files in a row.  Additionally, the cursor can be put on a
-specific line of a file by adding the line number
+But it is also possible to specify one or more options (see the next
+section), and to edit several files in a row.  Additionally, the cursor
+can be put on a specific line of a file by adding the line number
 with a plus sign before the filename, and even in a specific column by
-adding it with a comma.
-
-Also, if the first file specified is a dash, @code{nano} will read
-data from standard input.
-
-So a more complete command synopsis is:
+adding it with a comma.  So a more complete command synopsis is:
 
 @quotation
 @code{nano [OPTION]@dots{} [[+LINE[,COLUMN]|+,COLUMN] FILE]@dots{}}
 @end quotation
 
-But normally you would set your preferred options in your
-@file{.nanorc} file.  And when the @code{positionlog} option is set
+Normally, however, you set your preferred options in a @file{.nanorc}
+file (see @xref{Nanorc Files}).  And when using @code{set positionlog}
 (making @code{nano} remember the cursor position when you close a file),
 you will rarely need to specify a line number.
 
+As a special case: when the first file specified is a dash, @code{nano}
+will read data from standard input.  Which means you can pipe the output
+of a command straight into a buffer.
 
 @node Command-line Options
 @chapter Command-line Options