doc: Remove 'textmode'

by @mhinz

runtime/doc/editing.txt

@@ -500,7 +500,6 @@ The 'fileformat' option sets the <EOL> style for a file:
   "dos"		<CR><NL> or <NL>   DOS format		*DOS-format*
   "unix"	<NL>		   Unix format		*Unix-format*
   "mac"		<CR>		   Mac format		*Mac-format*
-Previously 'textmode' was used.  It is obsolete now.
 
 When reading a file, the mentioned characters are interpreted as the <EOL>.
 In DOS format (default for MS-DOS, OS/2 and Win32), <CR><NL> and <NL> are both

runtime/doc/insert.txt

@@ -1925,7 +1925,6 @@ The 'fileformat' option sets the <EOL> style for a file:
   "dos"		<CR><NL> or <NL>   DOS format
   "unix"	<NL>		   Unix format
   "mac"		<CR>		   Mac format
-Previously 'textmode' was used.  It is obsolete now.
 
 If 'fileformat' is "dos", a <CR> in front of an <NL> is ignored and a CTRL-Z
 at the end of the file is ignored.

runtime/doc/options.txt

@@ -1727,7 +1727,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 	'softtabstop'	  0		tabs are always 'tabstop' positions
 	'startofline'	  on		goto startofline with some commands
 	'tagrelative'	+ off		tag file names are not relative
-	'textauto'	+ off		no automatic textmode detection
+	'textauto'	+ off		no automatic fileformats detection
 	'textwidth'	  0		no automatic line wrap
 	'tildeop'	  off		tilde is not an operator
 	'ttimeout'	  off		no terminal timeout
@@ -2915,8 +2915,6 @@ A jump table for the options with a short description can be found at |Q_op|.
 	When this option is set, after starting to edit a file, the 'modified'
 	option is set, because the file would be different when written.
 	This option can not be changed when 'modifiable' is off.
-	For backwards compatibility: When this option is set to "dos",
-	'textmode' is set, otherwise 'textmode' is reset.
 
 					*'fileformats'* *'ffs'*
 'fileformats' 'ffs'	string (default:
@@ -7261,16 +7259,6 @@ A jump table for the options with a short description can be found at |Q_op|.
 	NOTE: This option is set to the Vi default value when 'compatible' is
 	set and to the Vim default value when 'compatible' is reset.
 
-				   *'textmode'* *'tx'* *'notextmode'* *'notx'*
-'textmode' 'tx'		boolean	(MS-DOS, Win32 and OS/2: default on,
-				 others: default off)
-			local to buffer
-			{not in Vi}
-	This option is obsolete.  Use 'fileformat'.
-	For backwards compatibility, when 'textmode' is set, 'fileformat' is
-	set to "dos".  When 'textmode' is reset, 'fileformat' is set to
-	"unix".
-
 						*'textwidth'* *'tw'*
 'textwidth' 'tw'	number	(default 0)
 			local to buffer

runtime/doc/quickref.txt

@@ -904,7 +904,6 @@ Short explanation of each option:		*option-list*
 'termencoding'	  'tenc'    character encoding used by the terminal
 'terse'			    shorten some messages
 'textauto'	  'ta'	    obsolete, use 'fileformats'
-'textmode'	  'tx'	    obsolete, use 'fileformat'
 'textwidth'	  'tw'	    maximum width of text that is being inserted
 'thesaurus'	  'tsr'     list of thesaurus files for keyword completion
 'tildeop'	  'top'     tilde command "~" behaves like an operator

runtime/doc/starting.txt

@@ -1157,10 +1157,10 @@ vimrc file.
 These commands will write ":map" and ":set" commands to a file, in such a way
 that when these commands are executed, the current key mappings and options
 will be set to the same values.  The options 'columns', 'endofline',
-'fileformat', 'key', 'lines', 'modified', 'scroll', 'term', 'textmode',
-'ttyfast' and 'ttymouse' are not included, because these are terminal or file
-dependent.  Note that the options 'binary', 'paste' and 'readonly' are
-included, this might not always be what you want.
+'fileformat', 'key', 'lines', 'modified', 'scroll', 'term', 'ttyfast' and
+'ttymouse' are not included, because these are terminal or file dependent.
+Note that the options 'binary', 'paste' and 'readonly' are included, this
+might not always be what you want.
 
 When special keys are used in mappings, The 'cpoptions' option will be
 temporarily set to its Vim default, to avoid the mappings to be