Specs: clean up the last remaining mentions of documents

sky/specs/markup.md

 Sky Markup: Syntax
 ==================
 
 A Sky file must consist of the following components:
 
  1. If the file is intended to be a top-level Sky application, the
     string "``#!mojo mojo:sky``" followed by a U+0020, U+000A or
     U+000D character.
 
     If the file is intended to be a module, then the string "SKY", a
@@ skipping 143 matching lines @@
 
 ``<import src="foo.sky">``
  - Downloads and imports foo.sky in the background.
 
 ``<import src="foo.sky" as="foo">``
  - Downloads and imports foo.sky in the background, using "foo" as its
    local name (see ``<script>``).
 
 ``<template>``
  - The contents of the element aren't placed in the Element itself.
-   They are instead placed into a DocumentFragment that you can obtain
-   from the element's "content" attribute.
+   They are instead placed into a Fragment that you can obtain from
+   the element's "content" attribute.
 
 ``<script>``
  - Blocks until all previous imports have been loaded, then loads the
    library given in the script block, as described in
    [scripts.md](scripts.md).
 
 ``<style>``
- - Adds the contents to the document's styles.
+ - Adds the contents to the module's styles.
 
 ``<content>``
 ``<content select="...">``
  - In a shadow tree, acts as an insertion point for distributed nodes.
    The select="" attribute gives the selector to use to pick the nodes
    to place in this insertion point; it defaults to everything.
 
 ``<img src="foo.bin">``
  - Sky fetches the bits for foo.bin, looks for a decoder for those
    bits, and renders the bits that the decoder returns.
@@ skipping 11 matching lines @@
 ``<t>``
  - Within a ``<t>`` section, whitespace is not trimmed from the start and
    end of text nodes by the parser.
    TOOD(ianh): figure out if the authoring aesthetics of this are ok
 
 ``<a href="foo.bin">``
  - A widget that, when invoked, causes mojo to open a new application
    for "foo.bin".
 
 ``<title>``
- - Sets the contents as the document's title (as provided by Sky to
+ - Sets the contents as the application's title (as provided by Sky to
    the view manager). (Actually just ensures that any time the element
-   is mutated, theTitleElement.ownerScope.ownerDocument.title is set
-   to the element's contents.)
+   is mutated, module.application.title is set to the element's
+   contents.)
 
 
 Sky Markup: Global Attributes
 =============================
 
 The following attributes are available on all elements:
 
 * ``id=""`` (any value)
 * ``class=""`` (any value, space-separated)
 * ``style=""`` (declaration part of a Sky style rule)
 * ``lang=""`` (language code)
 * ``dir=""`` (ltr or rtl only)
 * ``contenteditable=""`` (subject to future developments)
 * ``tabindex=""`` (subject to future developments)