docs(affix mode README): correct typo

jackhkmatthews · jackhkmatthews · commit 66899817a672 · 2018-06-06T14:50:55.000+01:00
diff --git a/README.md b/README.md
@@ -104,7 +104,7 @@ In this scenario the nav element will have the class `sn-affix` added when the u
 }
 ```
 
-A `[yOffset` can also be applied. Here `sn-affix` will be added when the top of the viewport is within 200 pixels of the top of the nav.
+A `[yOffset]` can also be applied. Here `sn-affix` will be added when the top of the viewport is within 200 pixels of the top of the nav.
 
 ```html
 <header>...</header>

Original file line number	Diff line number	Diff line change
@@ -104,7 +104,7 @@ In this scenario the nav element will have the class `sn-affix` added when the u
`104`	`104`	`}`
`105`	`105`	```
`106`	`106`
`107`		-A `[yOffset` can also be applied. Here `sn-affix` will be added when the top of the viewport is within 200 pixels of the top of the nav.
	`107`	+A `[yOffset]` can also be applied. Here `sn-affix` will be added when the top of the viewport is within 200 pixels of the top of the nav.
`108`	`108`
`109`	`109`	```html
`110`	`110`	`<header>...</header>`