[9.4](backport #50281) docs: fix 'ElasticSearch' casing and 'a SSL' -> 'an SSL' across reference docs

[mergify]

Fixes #50195.

Picks up the unambiguous items from the audit:

1. Product-name casing (2 files): ElasticSearch → Elasticsearch in the community-beats pages. Canonical name per Elastic style.

2. Article grammar (12 lines across 6 beats): not a SSL problem → not an SSL problem in the ssl-client-fails.md page for auditbeat / filebeat / heartbeat / metricbeat / packetbeat / winlogbeat. Same 2-line change in each beat (lines 61 + 66).

Docs-only; no schema or code changes.

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This is an automatic backport of pull request #50281 done by Mergify.

[github-actions]

🤖 GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)
• /test : Run the Buildkite pipeline.

[github-actions]

🔍 Preview links for changed docs

• docs/extend/community-beats.md
• docs/reference/auditbeat/ssl-client-fails.md
• docs/reference/filebeat/ssl-client-fails.md
• docs/reference/heartbeat/ssl-client-fails.md
• docs/reference/libbeat/community-beats.md
• docs/reference/metricbeat/ssl-client-fails.md
• docs/reference/packetbeat/ssl-client-fails.md
• docs/reference/winlogbeat/ssl-client-fails.md

[github-actions]

Vale Linting Results

Summary: 12 suggestions found

💡 Suggestions (12)

File	Line	Rule	Message
docs/reference/auditbeat/ssl-client-fails.md	59	Elastic.HeadingColons	Capitalize ': n'.
docs/reference/auditbeat/ssl-client-fails.md	64	Elastic.HeadingColons	Capitalize ': c'.
docs/reference/filebeat/ssl-client-fails.md	59	Elastic.HeadingColons	Capitalize ': n'.
docs/reference/filebeat/ssl-client-fails.md	64	Elastic.HeadingColons	Capitalize ': c'.
docs/reference/heartbeat/ssl-client-fails.md	59	Elastic.HeadingColons	Capitalize ': n'.
docs/reference/heartbeat/ssl-client-fails.md	64	Elastic.HeadingColons	Capitalize ': c'.
docs/reference/metricbeat/ssl-client-fails.md	59	Elastic.HeadingColons	Capitalize ': n'.
docs/reference/metricbeat/ssl-client-fails.md	64	Elastic.HeadingColons	Capitalize ': c'.
docs/reference/packetbeat/ssl-client-fails.md	59	Elastic.HeadingColons	Capitalize ': n'.
docs/reference/packetbeat/ssl-client-fails.md	64	Elastic.HeadingColons	Capitalize ': c'.
docs/reference/winlogbeat/ssl-client-fails.md	59	Elastic.HeadingColons	Capitalize ': n'.
docs/reference/winlogbeat/ssl-client-fails.md	64	Elastic.HeadingColons	Capitalize ': c'.

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