Fix bad heading in chapter 13 (#112)

keysmashes · mr-c · commit b2a6fed9ecb5 · 2018-07-10T18:02:19.000+03:00
Chapter 13 ("JavaScript Expressions") had a heading that referenced parameter references, presumably copy-pasted from chapter 6, so I changed it to refer to JavaScript expressions.
diff --git a/_episodes/13-expressions.md b/_episodes/13-expressions.md
@@ -86,7 +86,7 @@ Note that requirements must be provided as an array, with each entry (in this
 case, only `class: InlineJavascriptRequirement`) marked by a `-`. The same
 syntax is used to describe the additional command line arguments.
 
-> ## Where are parameter references allowed?
+> ## Where are JavaScript expressions allowed?
 > Just like [parameter references]({{ page.root }}{% link _episodes/06-params.md %}), you can use JavaScript Expressions
 > only in certain fields.  These are:
 > 

Original file line number	Diff line number	Diff line change
`@@ -86,7 +86,7 @@ Note that requirements must be provided as an array, with each entry (in this`
`86`	`86`	case, only `class: InlineJavascriptRequirement`) marked by a `-`. The same
`87`	`87`	`syntax is used to describe the additional command line arguments.`
`88`	`88`
`89`		`-> ## Where are parameter references allowed?`
	`89`	`+> ## Where are JavaScript expressions allowed?`
`90`	`90`	`> Just like [parameter references]({{ page.root }}{% link _episodes/06-params.md %}), you can use JavaScript Expressions`
`91`	`91`	`> only in certain fields. These are:`
`92`	`92`	`>`