Fix broken links when master is changed to main

Per https://github.com/elastic/docs/pull/2521, when we switch from "master" to "main" for our documentation URLs, the following links break:

- [x] /tmp/docsbuild/target_repo/html/cn/elasticsearch/php/6.0/_community_integrations.html See https://github.com/elasticsearch-cn/elasticsearch-php/pull/2
- [x] /tmp/docsbuild/target_repo/html/en/elasticsearch/hadoop/5.0/float.html See https://github.com/elastic/elasticsearch-hadoop/pull/2000
- [x] /tmp/docsbuild/target_repo/html/en/x-pack/5.0/field-and-document-access-control.html See https://github.com/elastic/x-pack/pull/5236
- [x] /tmp/docsbuild/target_repo/html/en/kibana/main/release-notes-8.0.0-beta1.html See https://github.com/elastic/kibana/pull/141322
- [x] /tmp/docsbuild/target_repo/html/en/elastic-stack-glossary/main/terms.html See https://github.com/elastic/stack-docs/pull/2233
- [x] /tmp/docsbuild/target_repo/html/en/elastic-stack/7.7/apm-highlights.html See https://github.com/elastic/apm-server/pull/9165
- [ ] https://www.elastic.co/guide/en/elasticsearch/plugins/2.4/cloud-aws-best-practices.html
- [ ] https://www.elastic.co/guide/en/elasticsearch/plugins/6.2/analysis-icu-collation-keyword-field.html
- [ ] https://www.elastic.co/guide/en/elasticsearch/reference/5.5/query-dsl-common-terms-query.html
- [x] https://www.elastic.co/guide/en/elasticsearch/reference/8.4/http-clients.html https://github.com/elastic/elasticsearch/pull/90276
- [x] https://www.elastic.co/guide/en/enterprise-search-clients/php/master/connecting.html https://github.com/elastic/enterprise-search-php/pull/27
- [x] https://www.elastic.co/guide/en/kibana/8.4/plugin-list.html#plugin-list https://github.com/elastic/kibana/pull/141514
- [x] https://www.elastic.co/guide/en/kibana/master/release-notes-8.0.0-beta1.html https://github.com/elastic/kibana/pull/141520
- [x] https://www.elastic.co/guide/en/welcome-to-elastic/current/troubleshooting-and-faqs.html https://github.com/elastic/tech-content/pull/241
- [x] /tmp/docsbuild/target_repo/html/en/beats/devguide/6.0/metricset-details.html See https://github.com/elastic/beats/pull/33319
- [x] /tmp/docsbuild/target_repo/html/en/beats/devguide/7.2/metricset-details.html See https://github.com/elastic/beats/pull/33318
- [x] /tmp/docsbuild/target_repo/html/en/app-search/current/web-crawler-reference.html https://github.com/elastic/enterprise-search-pubs/pull/2894
- [x] /tmp/docsbuild/target_repo/html/en/kibana/8.5/kibana-troubleshooting-kibana-server-logs.html https://github.com/elastic/kibana/pull/144749
- [x] /tmp/docsbuild/target_repo/html/en/kibana/main/connect-to-elasticsearch.html https://github.com/elastic/kibana/pull/145480
- [x] /tmp/docsbuild/target_repo/html/en/kibana/7.17/create-rule-api.html https://github.com/elastic/kibana/pull/145483

See also https://github.com/elastic/beats/issues/33577