Add diagnostic, image and update to glossary (#35610)

* add diagnostic, image and update

* Tiny tweak

---------

Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>

source/_data/glossary.yml

@@ -205,6 +205,11 @@
   definition: >-
     Device trackers are used to track the presence, or location, of a device.
   link: /integrations/device_tracker
+- term: Diagnostics
+  definition: >-
+    The diagnostics integration provides a way to download diagnostic data from a device or integration to share it in issue reports. Sharing diagnostics data when reporting an issue allows developers to diagnose and
+    fix your reported problem quicker.
+  link: /integrations/diagnostics
 - term: Discovery
   definition: >
     Discovery is the automatic setup of zeroconf/mDNS and uPnP devices after
@@ -361,6 +366,12 @@
   link: https://en.wikipedia.org/wiki/Host_(network)
   aliases:
     - hosts
+- term: Image
+  definition: >-
+    The Image integration allows other integrations to display a static image.
+  link: /integrations/image
+  aliases:
+    - images
 - term: Integration
   definition: >-
     Integrations connect and integrate Home Assistant with devices, services,
@@ -548,6 +559,8 @@
     Switches are things that have two states you can select between, such as
     turning on or off a socket.
   link: /integrations/switch/
+  aliases:
+    - switches
 - term: Template
   definition: >-
     A template is an automation definition that can include variables for the
@@ -599,6 +612,18 @@
     TTS (text-to-speech) allows Home Assistant to talk to you.
   link: /integrations/tts/
 
+- term: Update
+  definition: >-
+    An update entity is an entity that indicates if an update is available for a
+    device or service. This can be any update, be it a firmware update
+    for a device like a light bulb or router, or a software update for an add-on or a container.
+  excerpt: >
+    An update entity is an entity that indicates if an update is available for a
+    device or service.
+  link: /integrations/update
+  aliases:
+    - updates
+
 - term: Valve
   definition: >-
     Valves are devices to control the flow of liquids and gases. All valves in