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Docs/SSE: Misc updates and corrections (#35882)

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* Docs/SSE: Misc updates and coorections

* Update docs/sources/panels/expressions.md

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
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@ -11,9 +11,9 @@ Server-side expressions allow you to manipulate data returned from queries with
## Using expressions
The primary use case for expressions is for the upcoming next version of Grafana alerting. Like alerting, processing is done server-side, so expressions can operate without a browser session. However, expressions can be used with backend data sources and visualization as well.
Expressions are primarily used by the new [Grafana 8 alerts]({{< relref "../alerting/unified-alerting/" >}}). The processing is done server-side, so expressions can operate without a browser session. However, expressions can also be used with backend data sources and visualization.
> **Note:** Expressions do not work with current Grafana alerting.
> **Note:** Expressions do not work with legacy dashboard alerts.
> **Note:** Expressions do not work with dashboard variables.
@ -32,7 +32,7 @@ To reference the output of an individual expression or a data source query in an
Expressions work with two types of data.
- A collection of time series.
- A collection of numbers, where each collection could be a single series or single number.
- A collection of numbers, where each item in the collection is a single number.
Each collection is returned from a single data source query or expression and represented by the RefID. Each collection is a set, where each item in the set is uniquely identified by it dimensions which are stored as [labels]({{< relref "../basics/timeseries-dimensions.md#labels" >}}) or key-value pairs.