Fix session property limits to match SDK values

[nelsitoPuglisi]

Summary

• Update property value limit from 256 to 1024 characters — both Android and iOS SDKs use 1024
• Update default session property count from 10 to 100 — both Android and iOS SDKs default to 100
• Remove outdated reference to contacting support to increase limits

SDK sources:

• Android: SESSION_PROPERTY_VALUE_LIMIT = 1024 in SessionPropertiesServiceImpl.kt, SESSION_PROPERTY_LIMIT = 100 in SessionBehaviorImpl.kt
• iOS: maxValueLength = 1024 in MetadataHandler.swift, customPropertiesLimit = 100 in EmbraceStorage+Options.swift

Test plan

• Verify shared/property-limit.md renders correctly on pages that import it (e.g. session-properties, moments)

🤖 Generated with Claude Code

[github-actions]

Summary - Markdown Lint

Success: No issues found in 393 files (111ms)

[github-actions]

Summary - Link Checker

Status	Count
🔍 Total	478
✅ Successful	382
⏳ Timeouts	0
🔀 Redirected	1
👻 Excluded	95
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Redirects per input

Redirects in docs/data-destinations/honeycomb.md

• [200] https://docs.honeycomb.io/working-with-your-data/settings/api-keys/ | Redirect: Followed 2 redirects resolving to the final status of: OK. Redirects: https://docs.honeycomb.io/working-with-your-data/settings/api-keys/ --> https://docs.honeycomb.io/working-with-your-data/settings/api-keys --> https://docs.honeycomb.io/configure/environments/manage-api-keys
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