add small docs

Author: eronnen

lldb/include/lldb/API/SBTarget.h

@@ -349,8 +349,16 @@ class LLDB_API SBTarget {
 
   SBError SetLabel(const char *label);
 
+  /// Architecture opcode byte size width accessor
+  ///
+  /// \return
+  /// The minimum size in 8-bit (host) bytes of an opcode.
   uint32_t GetMinimumOpcodeByteSize() const;
 
+  /// Architecture opcode byte size width accessor
+  ///
+  /// \return
+  /// The maximum size in 8-bit (host) bytes of an opcode.
   uint32_t GetMaximumOpcodeByteSize() const;
 
   /// Architecture data byte width accessor