Add missing "Protocol" to chapter title (#297)

amartini51 · web-flow · commit 8e8520df8fd8 · 2024-04-26T11:40:35.000-07:00
This matches the use of "boxed protocol type" in the rest of the chapter.
diff --git a/TSPL.docc/LanguageGuide/OpaqueTypes.md b/TSPL.docc/LanguageGuide/OpaqueTypes.md
@@ -1,4 +1,4 @@
-# Opaque and Boxed Types
+# Opaque and Boxed Protocol Types
 
 Hide implementation details about a value's type.
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-# Opaque and Boxed Types`
	`1`	`+# Opaque and Boxed Protocol Types`
`2`	`2`
`3`	`3`	`Hide implementation details about a value's type.`
`4`	`4`