Document MainUI developer sidebar search abilities (#2062)

* MainUI developer sidebar: document the search

With https://github.com/openhab/openhab-webui/pull/1732, the developer
sidebar search was extended to check much more entities for the search
string. This lists what is possible now.

Signed-off-by: Florian Hotze <florianh_dev@icloud.com>

* Address review & Add missing Things

Signed-off-by: Florian Hotze <florianh_dev@icloud.com>

---------

Signed-off-by: Florian Hotze <florianh_dev@icloud.com>

tutorials/getting_started/tips-and-tricks.md

@@ -33,16 +33,43 @@ Bring up the sidebar through Developer Tools or the key combination <kbd>Alt</kb
 
 ![Developer Sidebar](images/developer-sidebar.png)
 
-Note that the sidebar will not come up if your display is to narrow.
+Note that the sidebar will not come up if your display is too narrow.
-It will not work on a phone nor on most tablet displays.
+It will not work on a phone nor in portrait mode on most tablet displays.
 
-There are four tabs on the sidebar.
+There are four tabs on the sidebar, and the search field at the top.
+
+### Search
+
+Imagine you need to find all usages of an Item in rules or pages.
+You could open all your rules and pages to check them, or just use the developer sidebar search.
+Enter your Item name, and you will see in which rules, scenes, scripts and pages that Item is used.
+
+The developer sidebar is checking your search query non case-intensive against the following entities:
+
+- Things
+  - UID
+  - label
+- Items
+  - name
+  - label
+  - tags (requires exact match)
+  - metadata namespaces (requires exact match)
+- Pages
+  - uid
+  - label
+  - content (widgets, tabs, charts, etc. with their configuration)
+- Rules, Scenes & Scripts
+  - Item name & Thing UID of triggers, actions & conditions
+  - script code (e.g. Rules DSL, JavaScript, and even Blockly)
+  - script MIME types (requires exact match)
 
 ### Pinned Objects
 
 Let's say you are working on your lighting automations which involves Things, Items, and Rules.
 Instead of keeping a dozen browser tabs open and flipping between them you can pin these objects to the sidebar.
-In the search box at the top, enter a search term which can be part of an object's name, ID, label, etc.
+
+Enter a search term in the search filed at the top to search within Items, Things, Rules, Scripts, Scenes and Pages.
+The search term can be part of an object's name, ID, label, etc.
 
 ![search](images/developer-sidebar-search.png)