patch 8.2.3285: scdoc filetype is not recognized

Problem:    Scdoc filetype is not recognized.
Solution:   Add filetype detection. (Gregory Anders, closes #8701)
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 4f94b96..cd40b6d 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -433,6 +433,7 @@
     \ 'scilab': ['file.sci', 'file.sce'],
     \ 'screen': ['.screenrc', 'screenrc'],
     \ 'sexplib': ['file.sexp'],
+    \ 'scdoc': ['file.scd'],
     \ 'scss': ['file.scss'],
     \ 'sd': ['file.sd'],
     \ 'sdc': ['file.sdc'],
diff --git a/src/version.c b/src/version.c
index 1b1f7a6..dfe952c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3285,
+/**/
     3284,
 /**/
     3283,