docs: mention that the 'nopauses' option is obsolete

doc/nano.texi

@@ -845,8 +845,7 @@ Don't automatically add a newline when a text does not end with one.
 (This can cause you to save non-POSIX text files.)
 
 @item set nopauses
-Don't pause between warnings at startup.  This means that only
-the last one will be visible (when there are multiple ones).
+Obsolete option.  Ignored.
 
 @item set nowrap
 Deprecated option since it has become the default setting.

doc/nanorc.5

@@ -183,8 +183,7 @@ Don't automatically add a newline when a text does not end with one.
 (This can cause you to save non-POSIX text files.)
 .TP
 .B set nopauses
-Don't pause between warnings at startup.  This means that only
-the last one will be visible (when there are multiple ones).
+Obsolete option.  Ignored.
 .TP
 .B set nowrap
 Deprecated option since it has become the default setting.

doc/sample.nanorc.in

@@ -97,10 +97,6 @@
 ## Don't automatically add a newline when a file does not end with one.
 # set nonewlines
 
-## Don't pause between warnings at startup.  Which means that only the
-## last one will be readable (when there are multiple ones).
-# set nopauses
-
 ## Set operating directory.  nano will not read or write files outside
 ## this directory and its subdirectories.  Also, the current directory
 ## is changed to here, so any files are inserted from this dir.  A blank

src/rcfile.c

@@ -67,7 +67,7 @@ static const rcoption rcopts[] = {
 #endif
 	{"nohelp", NO_HELP},
 	{"nonewlines", NO_NEWLINES},
-	{"nopauses", NO_PAUSES},
+	{"nopauses", NO_PAUSES},  /* Obsolete; remove in 2021. */
 #ifdef ENABLE_WRAPPING
 	{"nowrap", NO_WRAP},  /* Deprecated; remove in 2021. */
 #endif