[docs] Add missing JavaDocs (#6146)

wpiutil/src/main/native/include/wpi/sendable/SendableBuilder.h

@@ -15,12 +15,20 @@
 
 namespace wpi {
 
+/**
+ * Helper class for building Sendable dashboard representations.
+ */
 class SendableBuilder {
  public:
   /**
    * The backend kinds used for the sendable builder.
    */
-  enum BackendKind { kUnknown, kNetworkTables };
+  enum BackendKind {
+    /// Unknown.
+    kUnknown,
+    /// NetworkTables.
+    kNetworkTables
+  };
 
   virtual ~SendableBuilder() = default;
 

wpiutil/src/main/native/include/wpi/struct/DynamicStruct.h

@@ -32,18 +32,31 @@ class StructDescriptorDatabase;
  * Known data types for raw struct dynamic fields (see StructFieldDescriptor).
  */
 enum class StructFieldType {
+  /// bool.
   kBool,
+  /// char.
   kChar,
+  /// int8.
   kInt8,
+  /// int16.
   kInt16,
+  /// int32.
   kInt32,
+  /// int64.
   kInt64,
+  /// uint8.
   kUint8,
+  /// uint16.
   kUint16,
+  /// uint32.
   kUint32,
+  /// uint64.
   kUint64,
+  /// float.
   kFloat,
+  /// double.
   kDouble,
+  /// struct.
   kStruct
 };
 

wpiutil/src/main/native/include/wpi/struct/SchemaParser.h

@@ -17,18 +17,31 @@ namespace wpi::structparser {
  * A lexed raw struct schema token.
  */
 struct Token {
+  /** A lexed raw struct schema token kind. */
   enum Kind {
+    /// Unknown.
     kUnknown,
+    /// Integer.
     kInteger,
+    /// Identifier.
     kIdentifier,
+    /// Left square bracket.
     kLeftBracket,
+    /// Right square bracket.
     kRightBracket,
+    /// Left curly brace.
     kLeftBrace,
+    /// Right curly brace.
     kRightBrace,
+    /// Colon.
     kColon,
+    /// Semicolon.
     kSemicolon,
+    /// Comma.
     kComma,
+    /// Equals.
     kEquals,
+    /// End of input.
     kEndOfInput,
   };