Update docs with result from `make docs` command.

Signed-off-by: Ben Peachey <potherca@gmail.com>

docs/reference/buildx_build.md

@@ -38,7 +38,7 @@ Start a build
 | [`--platform`](#platform)                                                                                                                              | `stringArray` |           | Set target platform for build                                                                       |
 | `--print`                                                                                                                                              | `string`      |           | Print result of information request (e.g., outline, targets) [experimental]                         |
 | [`--progress`](#progress)                                                                                                                              | `string`      | `auto`    | Set type of progress output (`auto`, `plain`, `tty`). Use plain to show container output            |
-| [`--provenance`](#provenance)                                                                                                                          | `string`      |           | Shorthand for `--attest=type=provenance`                                                             |
+| [`--provenance`](#provenance)                                                                                                                          | `string`      |           | Shorthand for `--attest=type=provenance`                                                            |
 | `--pull`                                                                                                                                               |               |           | Always attempt to pull all referenced images                                                        |
 | [`--push`](#push)                                                                                                                                      |               |           | Shorthand for `--output=type=registry`                                                              |
 | `-q`, `--quiet`                                                                                                                                        |               |           | Suppress the build output and print image ID on success                                             |