message: [core] Remove useless doc comments
diff: @@ -89,7 +89,6 @@ where
  T: EnvTypes,
  <T as EnvTypes>::Address: for<'a> From<&'a [u8]>,
  {
  - /// Returns the address of the caller account.
  fn caller() -> <Self as EnvTypes>::Address {
  unsafe { sys::ext_caller() };
  let size = unsafe { sys::ext_scratch_size() };
  @@ -103,7 +102,6 @@ where
  value.as_slice().into()
  }
  - /// Returns the content of the input buffer.
  fn input() -> Vec<u8> {
  let size = unsafe { sys::ext_input_size() };
  if size == 0 {
  @@ -118,7 +116,6 @@ where
  }
  }
  - /// Ends the current contract execution and returns the given bytes to the calling contract.
  unsafe fn r#return(data: &[u8]) -> ! {
  sys::ext_return(data.as_ptr() as u32, data.len() as u32);
  }
  