Add subsection for exploring projects

Adds documentation for the 'Explore Projects' feature

doc/user/project/index.md

@@ -144,6 +144,17 @@ To view your starred projects:
    - Number of open merge requests
    - Number of open issues
 
+### Explore projects
+
+You can explore other popular projects available on GitLab. To explore projects:
+
+1. Click **Projects** in the navigation bar.
+1. Click **Explore Projects**.
+
+GitLab displays a list of projects, sorted by last updated date. To view
+projects with the most [stars](#star-a-project), click **Most stars**. To view
+projects with the largest number of comments in the past month, click **Trending**.
+
 ## Project settings
 
 Set the project's visibility level and the access levels to its various pages

doc/user/search/index.md

@@ -161,9 +161,9 @@ You can search through your projects from the left menu, by clicking the menu ba
 On the field **Filter by name**, type the project or group name you want to find, and GitLab
 will filter them for you as you type.
 
-You can also look for the projects you starred (**Starred projects**), and **Explore** all
+You can also look for the projects you [starred](../project/index.md#star-a-project) (**Starred projects**), and **Explore** all
 public and internal projects available in GitLab.com, from which you can filter by visibility,
-through **Trending**, best rated with **Most starts**, or **All** of them.
+through **Trending**, best rated with **Most stars**, or **All** of them.
 
 You can also sort them by **Name**, **Last created**, **Oldest created**, **Last updated**,
 **Oldest updated**, **Owner**, and choose to hide or show **archived projects**: