patch 8.2.3285: scdoc filetype is not recognized

Problem:    Scdoc filetype is not recognized.
Solution:   Add filetype detection. (Gregory Anders, closes #8701)

Author: gpanders

runtime/filetype.vim

@@ -1526,6 +1526,9 @@ au BufNewFile,BufRead *.sbt			setf sbt
 " Scilab
 au BufNewFile,BufRead *.sci,*.sce		setf scilab
 
+" scdoc
+au BufNewFile,BufRead *.scd			setf scdoc
+
 " SCSS
 au BufNewFile,BufRead *.scss			setf scss
 

src/testdir/test_filetype.vim

@@ -433,6 +433,7 @@ let s:filename_checks = {
     \ 'scilab': ['file.sci', 'file.sce'],
     \ 'screen': ['.screenrc', 'screenrc'],
     \ 'sexplib': ['file.sexp'],
+    \ 'scdoc': ['file.scd'],
     \ 'scss': ['file.scss'],
     \ 'sd': ['file.sd'],
     \ 'sdc': ['file.sdc'],

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3285,
 /**/
     3284,
 /**/