fix(vim-patch): add missing nginx runtime files (#15916)

Followup to incomplete runtime update https://github.com/neovim/neovim/pull/15911

runtime/doc/eval.txt

@@ -1316,7 +1316,7 @@ A string constant accepts these special characters:
 \<xxx>	Special key named "xxx".  e.g. "\<C-W>" for CTRL-W.  This is for use
 	in mappings, the 0x80 byte is escaped.
 	To use the double quote character it must be escaped: "<M-\">".
-	Don't use <Char-xxxx> to get a utf-8 character, use \uxxxx as
+	Don't use <Char-xxxx> to get a UTF-8 character, use \uxxxx as
 	mentioned above.
 
 Note that "\xff" is stored as the byte 255, which may be invalid in some
@@ -6344,8 +6344,8 @@ list2str({list} [, {utf8}])				*list2str()*
 			join(map(list, {nr, val -> nr2char(val)}), '')
 <		|str2list()| does the opposite.
 
-		When {utf8} is omitted or zero, the current 'encoding' is used.
-		When {utf8} is TRUE, always return UTF-8 characters.
+		UTF-8 encoding is always used, {utf8} option has no effect,
+		and exists only for backwards-compatibility.
 		With UTF-8 composing characters work as expected: >
 			list2str([97, 769])	returns "á"
 <
@@ -7007,8 +7007,7 @@ nr2char({expr} [, {utf8}])				*nr2char()*
 			nr2char(32)		returns " "
 <		Example for "utf-8": >
 			nr2char(300)		returns I with bow character
-<		When {utf8} is TRUE, always return UTF-8 characters.
-		UTF-8 encoding is always used, {utf8} option has no effect,
+<		UTF-8 encoding is always used, {utf8} option has no effect,
 		and exists only for backwards-compatibility.
 		Note that a NUL character in the file is specified with
 		nr2char(10), because NULs are represented with newline
@@ -8973,10 +8972,9 @@ str2list({string} [, {utf8}])				*str2list()*
 			str2list("ABC")		returns [65, 66, 67]
 <		|list2str()| does the opposite.
 
-		When {utf8} is omitted or zero, the current 'encoding' is used.
-		When {utf8} is TRUE, always treat the String as UTF-8
-		characters.  With UTF-8 composing characters are handled
-		properly: >
+		UTF-8 encoding is always used, {utf8} option has no effect,
+		and exists only for backwards-compatibility.
+		With UTF-8 composing characters are handled properly: >
 			str2list("á")		returns [97, 769]
 
 <		Can also be used as a |method|: >

runtime/doc/mbyte.txt

@@ -888,7 +888,7 @@ Motif.  Use the ":hi Menu font={fontname}" command for this. |:highlight|
 TYPING UTF-8						*utf-8-typing*
 
 If you are using X-Windows, you should find an input method that supports
-utf-8.
+UTF-8.
 
 If your system does not provide support for typing UTF-8, you can use the
 'keymap' feature.  This allows writing a keymap file, which defines a UTF-8

runtime/ftplugin/nginx.vim

@@ -0,0 +1,6 @@
+" Vim filetype plugin
+" Language: nginx.conf
+" Maintainer: Chris Aumann <me@chr4.org>
+" Last Change: Apr 15, 2017
+
+setlocal commentstring=#\ %s

runtime/indent/nginx.vim

@@ -0,0 +1,17 @@
+" Vim indent file
+" Language: nginx.conf
+" Maintainer: Chris Aumann <me@chr4.org>
+" Last Change: Apr 15, 2017
+
+if exists("b:did_indent")
+    finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=
+
+" cindent actually works for nginx' simple file structure
+setlocal cindent
+
+" Just make sure that the comments are not reset as defs would be.
+setlocal cinkeys-=0#