refactor(org-mode): rename embedded -> inline

Inline seems to be the better word. I also changed `:where`
to `:exports code`, which is usually required. Also I was confused by
`:where`, and `:exports code` signalizes that this is the inline code
header.

Author: dschrempf

org-mode/embedded

@@ -0,0 +1,6 @@
+# -*- mode: snippet -*-
+# name: inline code
+# key: inl
+# uuid: inl
+# --
+src_${1:language}${2:[${3::exports code}]}{${4:code}}