[8.x] [Docs] Fix typo on Lens page (#204847) (#204985)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Docs] Fix typo on Lens page
(#204847)](#204847)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Fix typo on Lens page (#204847)\n\n## Summary\r\n\r\nFixed
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Fix typo on Lens
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Fix typo on Lens page (#204847)\n\n## Summary\r\n\r\nFixed
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Co-authored-by: wajihaparvez <[email protected]>

docs/user/dashboard/lens.asciidoc

@@ -671,7 +671,7 @@ For area, line, and bar charts, press Shift, then click the series in the legend
 .*How do I visualize saved Discover sessions?*
 [%collapsible]
 ====
-Visualizing saved Discover sessions in unsupported.
+Visualizing saved Discover sessions is unsupported.
 ====
 
 [discrete]