Remainder operator doc (#1836)

* Adds remainder ops implementation for Tensor.

* Adds test for % operator.

* Add remainder and % operator entry in tensor.md

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Co-authored-by: Jonas Kantic <jk.mail@posteo.net>

burn-book/src/building-blocks/tensor.md

@@ -228,6 +228,7 @@ Those operations are available for numeric tensor kinds: `Float` and `Int`.
 | `tensor.powf_scalar(scalar)` or `tensor.powi_scalar(intscalar)` | `tensor.pow(scalar)`                           |
 | `tensor.prod()`                                                 | `tensor.prod()`                                |
 | `tensor.prod_dim(dim)`                                          | `tensor.prod(dim, keepdim=True)`               |
+| `tensor.rem(other)` or `tensor % other`                         | `tensor % other`                               |
 | `tensor.scatter(dim, indices, values)`                          | `tensor.scatter_add(dim, indices, values)`     |
 | `tensor.select(dim, indices)`                                   | `tensor.index_select(dim, indices)`            |
 | `tensor.select_assign(dim, indices, values)`                    | N/A                                            |