Fix typo in documentation comments. (#13)

Author: Lukas-Stuehrk

Sources/SwiftSemantics/Declarations/Class.swift

@@ -55,7 +55,7 @@ public struct Class: Declaration, Hashable, Codable {
      the following declaration of class `C`
      has a single requirement
      that its generic parameter identified as `"T"`
-     conforms to the type identified as `"Hahable"`:
+     conforms to the type identified as `"Hashable"`:
 
      ```swift
      class C<T> where T: Hashable {}

Sources/SwiftSemantics/Declarations/Enumeration.swift

@@ -53,7 +53,7 @@ public struct Enumeration: Declaration, Hashable, Codable {
      the following declaration of enumeration `E`
      has a single requirement
      that its generic parameter identified as `"T"`
-     conforms to the type identified as `"Hahable"`:
+     conforms to the type identified as `"Hashable"`:
 
      ```swift
      enum E<T> where T: Hashable {}

Sources/SwiftSemantics/Declarations/Extension.swift

@@ -37,7 +37,7 @@ public struct Extension: Declaration, Hashable, Codable {
      the following conditional extension on structure S
      has a single requirement
      that its generic parameter identified as `"T"`
-     conforms to the type identified as `"Hahable"`:
+     conforms to the type identified as `"Hashable"`:
 
      ```swift
      struct S<T> {}

Sources/SwiftSemantics/Declarations/Function.swift

@@ -38,7 +38,7 @@ public struct Function: Declaration, Hashable, Codable {
      the following declaration of function `f`
      has a single requirement
      that its generic parameter identified as `"T"`
-     conforms to the type identified as `"Hahable"`:
+     conforms to the type identified as `"Hashable"`:
 
      ```swift
      func f<T>(value: T) where T: Hashable {}

Sources/SwiftSemantics/Declarations/Initializer.swift

@@ -41,7 +41,7 @@ public struct Initializer: Declaration, Hashable, Codable {
      the following initializer declaration
      has a single requirement
      that its generic parameter identified as `"T"`
-     conforms to the type identified as `"Hahable"`:
+     conforms to the type identified as `"Hashable"`:
 
      ```swift
      init<T>(value: T) where T: Hashable {}

Sources/SwiftSemantics/Declarations/Structure.swift

@@ -50,7 +50,7 @@ public struct Structure: Declaration, Hashable, Codable {
      the following declaration of structure `S`
      has a single requirement
      that its generic parameter identified as `"T"`
-     conforms to the type identified as `"Hahable"`:
+     conforms to the type identified as `"Hashable"`:
 
      ```swift
      struct S<T> where T: Hashable {}

Sources/SwiftSemantics/Declarations/Subscript.swift

@@ -35,7 +35,7 @@ public struct Subscript: Declaration, Hashable, Codable {
      the following subscript declaration
      has a single requirement
      that its generic parameter identified as `"T"`
-     conforms to the type identified as `"Hahable"`:
+     conforms to the type identified as `"Hashable"`:
 
      ```swift
      subscript<T>(value: T) where T: Hashable {}