Docs for personalized search rankings (#1058)

- #1048

Author: MaedahBatool

docs/code-search/features.mdx

@@ -95,6 +95,32 @@ You get the following improvements:
 - **Reworked fuzzy finder ⌘K**: Find files and symbols quickly and easily with our whole new fuzzy finder
 - **File actions**: Like open in editor and open on code host
 
+## Personalized search ranking
+
+Sourcegraph Enterprise users can get more personalized and better-ranked search results in the search bar for their codebases. With this feature, you get:
+
+- Improved ranking for keyword searches like "data router". This capability is enabled by default and cannot be configured
+- Personalized ranking, specifically boosted results from repos you recently contributed to. This is controlled by the setting `experimentalFeatures.boostRelevantRepositories`
+
+These boosted results from your recently contributed repositories make finding the code you care about easier.
+
+The personalized search ranking works best if you have large codebases, especially for new users who may otherwise get overwhelmed by results from unfamiliar or irrelevant repositories.
+
+Personalized search ranking is enabled by default, but you can disable it from your settings via:
+
+```json
+experimentalFeatures: {
+  boostRelevantRepositories: false
+}
+```
+
+Here is an example of search results with personalized search ranking enabled:
+
+![search-ranking-enabled](https://storage.googleapis.com/sourcegraph-assets/Docs/personalized-search-rankings.png)
+
+As you can see, the results are now ranked based on their relevance to the query, and the results from repositories you've recently contributed to are boosted.
+
+
 ## Other search tips
 
 - When viewing a file or directory, press the `y` key to expand the URL to its canonical form (with the full 40-character Git commit SHA).