Doc: Describe Call Hierarchy view and language server button

Task-number: QTCREATORBUG-28721
Change-Id: I9275c5f0a7ca838aab29c42962e88d4b80ed8622
Reviewed-by: David Schulz <david.schulz@qt.io>

doc/qtcreator/src/editors/creator-coding-edit-mode.qdoc

@@ -28,7 +28,7 @@
     open in the editor.
 
     \if defined(qtcreator)
-    \image qtcreator-editortoolbar-symbols.png
+    \image qtcreator-editortoolbar-symbols.webp {Edit mode toolbar}
     \else
     \image studio-edit-mode.png
     \endif
@@ -116,6 +116,16 @@
     \uicontrol {Project Settings} > \uicontrol Editor.
     \if defined(qtcreator)
     For more information, see \l {Specifying Editor Settings}.
+
+    \section2 Managing Language Servers
+
+    Select the \inlineimage icons/languageclient.png
+    icon on the editor toolbar (7) to view the \l{Using Language Servers}
+    {language server} for the current project. You can restart the language
+    server or select another one in the menu. Also, you can
+    \l{Inspecting Language Clients}{inspect the communication} between \QC
+    and language servers and view server capabilities, as well as
+    \l{Specifying Settings for Language Clients}{set language server preferences}.
     \endif
 
     \section1 Editing Selected Lines

doc/qtcreator/src/editors/creator-only/creator-language-server.qdoc

@@ -32,6 +32,8 @@
             \l{Viewing Defined Types and Symbols}{Outline} view or
             in the \uicontrol Symbols list on the \l{Using the Editor Toolbar}
             {editor toolbar}
+        \li \l{Viewing Call Hierarchy}
+            {Viewing the callers and callees of a function}
         \li \l{Finding Symbols}{Finding references to symbols}
         \li \l{Renaming Symbols}{Renaming the symbol under cursor}
         \li Code actions
@@ -184,6 +186,10 @@
     determines when the server is started. The information displayed depends on
     the language server.
 
+    Select the \inlineimage icons/languageclient.png
+    button on the \l{Managing Language Servers}{editor toolbar}, and then select
+    \uicontrol {Restart} to restart language servers.
+
     \uicontrol Log displays additional information about the selected log entry.
     You can see the \uicontrol {Content length} and \uicontrol {MIME type} of
     a \uicontrol {Client Message} and \uicontrol {Server Message}, as well as

doc/qtcreator/src/user-interface/creator-views.qdoc

@@ -102,6 +102,21 @@
     To visit all parts of a namespace, double-click on the namespace item
     multiple times.
 
+    \section1 Viewing Call Hierarchy
+
+    The \uicontrol {Call Hierarchy} view shows information about incoming and
+    outgoing function calls from a \l{Using Language Servers}{language server}.
+    Place the cursor on a function definition in the code editor to see lists
+    of functions that call it and the functions it calls. This works recursively,
+    so you can also see the caller of the caller. However, Clangd only lists
+    incoming calls.
+
+    Select the \inlineimage icons/languageclient.png
+    button on the \l{Managing Language Servers}{editor toolbar}, and then select
+    \uicontrol {Restart} to collect call hierarchy information for the function.
+
+    \image qtcreator-call-hierarchy-view.png {Call Hierarchy view}
+
     \section1 Viewing Type Hierarchy
 
     To view the base classes and derived classes of a class, right-click the