Bump docs-resources from a88e6af to 0904c8a (#987)

Bumps [docs-resources](https://github.com/riscv/docs-resources) from
`a88e6af` to `0904c8a`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/riscv/docs-resources/commit/0904c8ad991d189c882a922563060a7806c78f55"><code>0904c8a</code></a>
Merge pull request <a
href="https://redirect.github.com/riscv/docs-resources/issues/241">#241</a>
from riscv/add_merged_param_csr_table</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/7e4366e2947314cab49ed873583bece0c498b46d"><code>7e4366e</code></a>
Clarify at least one of --param-table/--csr-table must be provided in
README</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/2aa2a79e9d7f970eaca29e90a53ee3cb6d11ee27"><code>2aa2a79</code></a>
Update tests/params/expected/test-csr-appendix.adoc</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/98e26a730f31be41f15384b525b06dddbdb6157f"><code>98e26a7</code></a>
Update Makefile</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/98653ed4dd926b50c0be5fc2aae02826972adecf"><code>98653ed</code></a>
Update Makefile</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/0149c3bb42f60de5094bb9d874055bb51dccfab2"><code>0149c3b</code></a>
Combined CSRs into param table adoc files</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/842130eab6fff2eb8d292c2a784c4747e82fe52e"><code>842130e</code></a>
Work in progress ...</li>
<li>See full diff in <a
href="https://github.com/riscv/docs-resources/compare/a88e6af067c14e92be2f456bc2d6a310530d6549...0904c8ad991d189c882a922563060a7806c78f55">compare
view</a></li>
</ul>
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