Updated documentation style guide (#28488)

* Added node_exporter to the list of words to use in Grafana documentation style guide

* Update contribute/style-guides/documentation-style-guide.md

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

contribute/style-guides/documentation-style-guide.md

@@ -223,6 +223,13 @@ Do not hyphenate when it is used as a noun. For example: _Open source is the bes
 
 Two words if used as a verb, one word if used as a noun.
 
+### node_exporter, windows_exporter
+
+When referencing the Prometheus data source exporters, always use "node_exporter" and "windows_exporter" when referring to those tools.
+
+**Correct:** node_exporter, windows_exporter
+**Incorrect:** Node Exporter, node exporter, Windows Exporter, Windows exporter, windows exporter 
+
 **Examples**
 
 - Set up the workspace.