Fix broken links reported by new checker

[guimachiavelli]

The broken links checker created in #2507 has found quite a few issues. We need to resolve these before we can merge that PR.

Table copied from #2507

Broken link	Type	File
/learn/cookbooks/dockerr.mdx	link	/./home.mdx
/learn/front_end/search_preview	link	/learn/what_is_meilisearch/overview.mdx
/learn/configuration/instance_options#http-address-port-binding	hash	/learn/getting_started/search_preview.mdx
/learn/core_concepts/primary_key#primary-key-2	hash	/learn/core_concepts/documents.mdx
/learn/advanced/sorting	link	/learn/core_concepts/indexes.mdx
/learn/advanced/sorting	link	/learn/core_concepts/relevancy.mdx
/learn/core_concepts/relevancy#_2-typo	hash	/learn/core_concepts/relevancy.mdx
/reference/errors/error_codes#task-not-found	hash	/learn/async/asynchronous_operations.mdx
/learn/core_concepts/relevancy#_2-typo	hash	/learn/index_settings/typo_tolerance.mdx
/learn/fine_tuning_results/geosearch#filtering-results-with-georadius-and-geoboundingbox	hash	/learn/fine_tuning_results/filtering.mdx
/learn/advanced/sorting#configuring-meilisearch-for-sorting-at-search-time	link	/learn/fine_tuning_results/geosearch.mdx
/learn/advanced/sorting#sorting-results-at-search-time	link	/learn/fine_tuning_results/geosearch.mdx
/learn/advanced/sorting#sorting-and-custom-ranking-rules	link	/learn/fine_tuning_results/geosearch.mdx
/reference/errors/error_codes#invalid-search-sort	hash	/learn/fine_tuning_results/geosearch.mdx
/learn/fine_tuning_results/geosearch#sorting-results-with-geopoint	hash	/learn/fine_tuning_results/sorting.mdx
/reference/api/keys#actions-2	hash	/learn/security/tenant_tokens.mdx
/reference/api/keys#actions-2	hash	/learn/security/tenant_tokens.mdx
/learn/core_concepts/primary_key#primary-key-2	hash	/reference/api/documents.mdx
/learn/core_concepts/primary_key#primary-key-2	hash	/reference/api/documents.mdx
/learn/advanced/sorting	link	/reference/api/search.mdx
/learn/core_concepts/relevancy#_5-sort	hash	/reference/api/search.mdx
/reference/errors/error_codes#invalid-search-filter	hash	/reference/api/search.mdx
/learn/fine_tuning_results/geosearch#sorting-results-with-geopoint	hash	/reference/api/search.mdx
/reference/api/search#search-in-an-index-with-post-route	hash	/reference/api/keys.mdx
/reference/api/search#search-in-an-index-with-get-route	hash	/reference/api/keys.mdx
/reference/errors/error_codes#api-key-not-found	hash	/reference/api/keys.mdx
/learn/advanced/sorting	link	/reference/api/settings.mdx
/learn/advanced/sorting	link	/reference/api/settings.mdx
/learn/advanced/sorting	link	/reference/api/settings.mdx
/reference/api/indexes#body-3	hash	/reference/errors/error_codes.mdx
/reference/api/indexes#body-3	hash	/reference/errors/error_codes.mdx
/reference/api/indexes#body-3	hash	/reference/errors/error_codes.mdx

[curquiza]

Fixed by #2507 that is integrated into #2507 (which is merged)