docs: document the newly added color name "normal"

doc/nano.texi

@@ -755,7 +755,8 @@ Use this color combination for the concise function descriptions
 in the two help lines at the bottom of the screen.
 Valid names for foreground and background color are:
 @code{white}, @code{black}, @code{blue}, @code{green},
-@code{red}, @code{cyan}, @code{yellow}, and @code{magenta}.
+@code{red}, @code{cyan}, @code{yellow}, @code{magenta}, and @code{normal}
+--- where @code{normal} means the default foreground or background color.
 The name of the foreground color may be prefixed with @code{bright}.
 And either @var{fgcolor} or ,@var{bgcolor} may be left out.
 

doc/nanorc.5

@@ -264,7 +264,9 @@ Save automatically on exit, don't prompt.
 .B set titlecolor \fIfgcolor\fR,\fIbgcolor\fR
 Specify the color combination to use for the title bar.
 Valid names for the foreground and background colors are:
-.BR white ", " black ", " blue ", " green ", " red ", " cyan ", " yellow ",  and " magenta .
+.BR white ", " black ", " blue ", " green ", " red ", "
+.BR cyan ", " yellow ", " magenta ", and " normal
+-- where \fBnormal\fR means the default foreground or background color.
 The name of the foreground color may be prefixed with \fBbright\fR.
 And either "\fIfgcolor\fR" or ",\fIbgcolor\fR" may be left out.
 .TP

syntax/nanorc.nanorc

@@ -8,7 +8,7 @@ icolor brightred "^[[:space:]]*((un)?(bind|set)|include|syntax|header|magic|comm
 
 # Keywords
 icolor brightgreen "^[[:space:]]*(set|unset)[[:space:]]+(allow_insecure_backup|atblanks|autoindent|backup|backwards|boldtext|casesensitive|constantshow|cutfromcursor|fill[[:space:]]+-?[[:digit:]]+|historylog|linenumbers|locking|morespace|mouse|multibuffer|noconvert|nohelp|nopauses|nonewlines|nowrap|positionlog|preserve|quickblank|quiet|rebinddelete|rebindkeypad|regexp|showcursor|smarthome|smooth|softwrap|suspend|tabsize[[:space:]]+[1-9][0-9]*|tabstospaces|tempfile|trimblanks|unix|view|wordbounds)\>"
-icolor yellow "^[[:space:]]*set[[:space:]]+((error|function|key|number|selected|status|title)color)[[:space:]]+(bright)?(white|black|red|blue|green|yellow|magenta|cyan)?(,(white|black|red|blue|green|yellow|magenta|cyan))?\>"
+icolor yellow "^[[:space:]]*set[[:space:]]+((error|function|key|number|selected|status|title)color)[[:space:]]+(bright)?(white|black|red|blue|green|yellow|magenta|cyan|normal)?(,(white|black|red|blue|green|yellow|magenta|cyan|normal))?\>"
 icolor brightgreen "^[[:space:]]*set[[:space:]]+(backupdir|brackets|errorcolor|functioncolor|keycolor|matchbrackets|numbercolor|operatingdir|punct|quotestr|selectedcolor|speller|statuscolor|titlecolor|whitespace|wordchars)[[:space:]]+"
 icolor brightgreen "^[[:space:]]*bind[[:space:]]+((\^([[:alpha:]]|[]0-9\^_]|Space)|M-([[:alpha:]]|[]!"#$%&'()*+,./0-9:;<=>?@\^_`{|}~-]|Space))|F([1-9]|1[0-6])|Ins|Del)[[:space:]]+([[:alpha:]]+|".*")[[:space:]]+(all|main|search|replace(with)?|gotoline|writeout|insert|ext(ernal)?cmd|help|spell|linter|browser|whereisfile|gotodir)([[:space:]]+#|[[:space:]]*$)"
 icolor brightgreen "^[[:space:]]*unbind[[:space:]]+((\^([[:alpha:]]|[]0-9\^_]|Space)|M-([[:alpha:]]|[]!"#$%&'()*+,./0-9:;<=>?@\^_`{|}~-]|Space))|F([1-9]|1[0-6])|Ins|Del)[[:space:]]+(all|main|search|replace(with)?|gotoline|writeout|insert|ext(ernal)?cmd|help|spell|linter|browser|whereisfile|gotodir)([[:space:]]+#|[[:space:]]*$)"
@@ -20,7 +20,7 @@ icolor green "^[[:space:]]*((un)?(bind|set)|include|syntax|header|magic|comment|
 color brightmagenta "".+"([[:space:]]|$)"
 
 # Colors
-icolor yellow "^[[:space:]]*i?color[[:space:]]*(bright)?(white|black|red|blue|green|yellow|magenta|cyan)?(,(white|black|red|blue|green|yellow|magenta|cyan))?\>"
+icolor yellow "^[[:space:]]*i?color[[:space:]]*(bright)?(white|black|red|blue|green|yellow|magenta|cyan|normal)?(,(white|black|red|blue|green|yellow|magenta|cyan|normal))?\>"
 icolor magenta "^[[:space:]]*i?color\>" "\<(start|end)="
 
 # Comments