Typography copy edits from tech writer

Reviewers: iangordon, #material_components_ios_owners, featherless

Reviewed By: #material_components_ios_owners, featherless

Projects: #material_components_ios

Differential Revision: http://codereview.cc/D98

Author: randallli

components/Typography/README.md

@@ -1,8 +1,7 @@
 # Typography
 
-Typography provides methods for displaying text in [material styles]
-(https://www.google.com/design/spec/style/typography.html). Mostly centered
-around fonts and their opacity.
+The Typography component provides methods for displaying text in [material styles]
+(https://www.google.com/design/spec/style/typography.html), focusing on fonts and their opacity.
 
 ## Requirements
 
@@ -25,11 +24,11 @@ label.alpha = [MDCTypography titleFontOpacity];
 ## Font sizes
 ![type size](gfx/style_typography_styles_scale.png "shows the various font
 sizes")
-Source: [Typography scale spec]
-(https://www.google.com/design/spec/style/typography.html#typography-styles).
+Source: [Typography style spec]
+(https://www.google.com/design/spec/style/typography.html#typography-styles)
 
 ## Font opacities
 ![type opacity](gfx/style_typography_styles_contrast.png "shows the various font
 opacities")
 Source: [Typography opacity spec]
-(https://www.google.com/design/spec/style/typography.html#typography-other-typographic-guidelines).
+(https://www.google.com/design/spec/style/typography.html#typography-other-typographic-guidelines)