docs: mention the default value for 'errorcolor'

doc/nano.texi

@@ -764,6 +764,7 @@ Do not use the line below the title bar, leaving it entirely blank.
 
 @item set errorcolor @var{fgcolor},@var{bgcolor}
 Use this color combination for the status bar when an error message is displayed.
+The default value is @t{brightwhite,red}.
 @xref{@code{set functioncolor}} for valid color names.
 
 @item set fill @var{number}

doc/nanorc.5

@@ -115,6 +115,7 @@ Do not use the line below the title bar, leaving it entirely blank.
 .TP
 .B set errorcolor \fIfgcolor\fR,\fIbgcolor\fR
 Use this color combination for the status bar when an error message is displayed.
+The default value is \fBbrightwhite,red\fR.
 See \fBset titlecolor\fR for valid color names.
 .TP
 .B set fill \fInumber\fR
@@ -122,7 +123,7 @@ Set the target width for justifying and automatic hard-wrapping at this
 \fInumber\fR of columns.  If the value is 0 or less, wrapping will occur
 at the width of the screen minus \fInumber\fR columns, allowing the wrap
 point to vary along with the width of the screen if the screen is resized.
-The default value is \-8.
+The default value is \fB\-8\fR.
 .TP
 .B set functioncolor \fIfgcolor\fR,\fIbgcolor\fR
 Specify the color combination to use for the function descriptions