Merge pull request #401 from cr0ybot/cr0ybot-patch-1

Markup page typo fixes

_includes/markdown/Markup.md

@@ -193,16 +193,16 @@ If accessibility starts with HTML, media is how we make it come alive. Creating
 To read more about any of the guidelines outlined in this section, please visit the [WCAG quickref document](https://www.w3.org/WAI/WCAG21/quickref/). Some of the more aggressive guidelines in Level AAA are not mentioned here. Be sure to check with your project lead about the accessibility compliance level you need to follow.
 
 ### Images
-Images are the most common for of media we encounter in our day to day work. WCAG guidelines pertaining to images are: [1.1.1 Non-text content](https://www.w3.org/WAI/WCAG21/quickref/#non-text-content) and [1.4.4 Images of text](https://www.w3.org/WAI/WCAG21/quickref/#images-of-text). Following these two rules will ensure that our images always have alternative text and any time text is represented in an image there is always a purely text-based version of it available for users of assistive technology.
+Images are the most common form of media we encounter in our day to day work. WCAG guidelines pertaining to images are: [1.1.1 Non-text content](https://www.w3.org/WAI/WCAG21/quickref/#non-text-content) and [1.4.4 Images of text](https://www.w3.org/WAI/WCAG21/quickref/#images-of-text). Following these two rules will ensure that our images always have alternative text and any time text is represented in an image there is always a purely text-based version of it available for users of assistive technology.
 
 ### Audio & Video
 Between audio and video, we certainly deal with video more often, but there are some WCAG guidelines that encompass both, such as: [1.2.2 Audio/Video-only](https://www.w3.org/WAI/WCAG21/quickref/#audio-only-and-video-only-prerecorded) and [1.2.3 Audio Descriptions or Media Alternative](https://www.w3.org/WAI/WCAG21/quickref/#audio-description-prerecorded). Both these guidelines address the creation of text-based versions of the media being presented to a user. This typically comes in the form of an audio track on a video, or a transcript outputted on the page somewhere. As an aside, outputting a transcript will help the content get indexed by search engines, rather than just having the content inside a media element (audio/video)
 
 ### Audio
-Audio is an important part of the work we do; making that content accessible to all users is extremely valuable. Guideline [1.4.1 Audio Control](https://www.w3.org/WAI/WCAG21/quickref/#audio-control) is related to autoplaying audio. The general rule is: don't autoplay audio. However, if you do,  and that audio is playing for more than three seconds 1.4.1 states that either a mechanism must be available to pause or stop the audio, or a mechanism must be available to control audio volume independently from the overall system volume level. This is important for any user with and auditory disorder.
+Audio is an important part of the work we do; making that content accessible to all users is extremely valuable. Guideline [1.4.1 Audio Control](https://www.w3.org/WAI/WCAG21/quickref/#audio-control) is related to autoplaying audio. The general rule is: don't autoplay audio. However, if you do, and that audio is playing for more than three seconds, 1.4.1 states that either a mechanism must be available to pause or stop the audio, or a mechanism must be available to control audio volume independently from the overall system volume level. This is important for any user with an auditory disorder.
 
 ### Video
-When putting video on the Web (that contains dialog), [guideline 1.2.2](https://www.w3.org/WAI/WCAG21/quickref/#captions-prerecorded) states that captions must be present, without exception. While we can't always control the content that's placed on a site, we can be sure to guide clients towards a situation for compliance but suggesting transcription services. Other than alternative text, dealing with captions is the most common media accessibility issue you'll likely have to deal with.
+When putting video on the Web (that contains dialog), [guideline 1.2.2](https://www.w3.org/WAI/WCAG21/quickref/#captions-prerecorded) states that captions must be present, without exception. While we can't always control the content that's placed on a site, we can be sure to guide clients towards a situation for compliance by suggesting transcription services. Other than alternative text, dealing with captions is the most common media accessibility issue you'll likely have to deal with.
 
 <h2 id="svg" class="anchor-heading">SVG {% include Util/link_anchor anchor="svg" %}</h2>
 <abbr title="Scaleable Vector Graphic">SVG</abbr> has become a prevalent means for displaying rich vector graphics. <abbr>SVG</abbr> images are great for graphics with well-defined lines and simple color palettes that can be defined algorithmically, e.g. logos, iconography, and illustrations. Here are a few known benefits of SVG: