Add some simple documentation

src/main/java/io/outfoxx/typescriptpoet/ClassSpec.kt

@@ -17,6 +17,7 @@
 package io.outfoxx.typescriptpoet
 
 
+/** A generated `class` declaration. */
 class ClassSpec
 private constructor(
    builder: Builder

src/main/java/io/outfoxx/typescriptpoet/DecoratorSpec.kt

@@ -17,6 +17,7 @@
 package io.outfoxx.typescriptpoet
 
 
+/** A generated function or class decorator declaration. */
 class DecoratorSpec
 internal constructor(
    builder: Builder

src/main/java/io/outfoxx/typescriptpoet/EnumSpec.kt

@@ -17,6 +17,7 @@
 package io.outfoxx.typescriptpoet
 
 
+/** A generated `enum` declaration. */
 class EnumSpec
 private constructor(
    builder: Builder

src/main/java/io/outfoxx/typescriptpoet/FunctionSpec.kt

@@ -17,7 +17,11 @@
 package io.outfoxx.typescriptpoet
 
 
-class FunctionSpec private constructor(builder: Builder) {
+/** A generated function declaration. */
+class FunctionSpec
+private constructor(
+   builder: Builder
+) {
   val name = builder.name
   val javaDoc = builder.javaDoc.build()
   val decorators = builder.decorators.toImmutableList()

src/main/java/io/outfoxx/typescriptpoet/InterfaceSpec.kt

@@ -17,6 +17,7 @@
 package io.outfoxx.typescriptpoet
 
 
+/** A generated `interface` declaration. */
 class InterfaceSpec
 private constructor(
    builder: Builder

src/main/java/io/outfoxx/typescriptpoet/Modifier.kt

@@ -17,6 +17,7 @@
 package io.outfoxx.typescriptpoet
 
 
+/** Available declaration modifiers. */
 enum class Modifier {
   EXPORT,
   PUBLIC,

src/main/java/io/outfoxx/typescriptpoet/ModuleSpec.kt

@@ -17,6 +17,7 @@
 package io.outfoxx.typescriptpoet
 
 
+/** A generated `module` declaration. */
 class ModuleSpec
 private constructor(
    builder: Builder

src/main/java/io/outfoxx/typescriptpoet/PropertySpec.kt

@@ -17,6 +17,7 @@
 package io.outfoxx.typescriptpoet
 
 
+/** A generated property declaration. */
 class PropertySpec
 private constructor(
    builder: Builder