fix typo

[musvaage]

noticed in gonum repository

[w3cbot]

gkellogg marked as non substantive for IPR from ash-nazg.

[musvaage]

@gkellogg

another typo

$ grep -nr avaliable rdf-canon
rdf-canon/tests/index.html:58:    <p>A previous version of this test suite included tests for the URGNA2012 profile, which is non-normative. Those tests continue to be avaliable in the <a href="https://w3c-ccg.github.io/rdf-dataset-canonicalization/tests">Credentials Community Group repository</a>.</p>
rdf-canon/tests/template.haml:55:      A previous version of this test suite included tests for the URGNA2012 profile, which is non-normative. Those tests continue to be avaliable in the [Credentials Community Group repository](https://w3c-ccg.github.io/rdf-dataset-canonicalization/tests).
$ 
`