Doc: Update Performance Analyzer docs

- Describe Create Memory Trace Points button
- Describe Create Memory Trace Points dialog in more detail
- Fix "Load perf.data File" menu item name
- Update screenshots

Task-number: QTCREATORBUG-26278
Change-Id: I028d8da6f19a61bbe457c94287779c2aed0ab7ba
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

doc/qtcreator/src/analyze/cpu-usage-analyzer.qdoc

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2019 The Qt Company Ltd.
+** Copyright (C) 2021 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the Qt Creator documentation.
@@ -72,7 +72,9 @@
         \li Select the
             \inlineimage qtcreator-analyze-start-button.png
             (\uicontrol Start) button to start the application from the
-            Performance Analyzer.
+            \uicontrol {Performance Analyzer}.
+
+            \inlineimage qtcreator-performance-analyzer-toolbar.png "Performance Analyzer toolbar"
 
     \endlist
 
@@ -101,9 +103,21 @@
 
     To create trace points for profiling memory usage on a target device, select
     \uicontrol Analyze > \uicontrol {Performance Analyzer Options} >
-    \uicontrol {Create Memory Trace Points}.
+    \uicontrol {Create Memory Trace Points} or select
+    \inlineimage icons/create-tracepoint.png
+    on the \uicontrol {Performance Analyzer} toolbar.
 
-    To add events for the trace points, see \l{Choosing Event Types}
+    In the \uicontrol {Create Memory Trace Points} dialog, you can modify the
+    script to run.
+
+    \image qtcreator-performance-analyzer-create-memory-trace-points.png "Create Memory Trace Points dialog"
+
+    If you need root privileges to run scripts as root, select the privileges to
+    use in the \uicontrol {Elevate privileges using} field.
+
+    Select \uicontrol OK to run the script.
+
+    To add events for the trace points, see \l{Choosing Event Types}.
 
     You can record a memory trace to view usage graphs in the samples rows of
     the timeline and to view memory allocations, peaks, and releases in the
@@ -418,8 +432,8 @@
 
     You can load any \c perf.data files generated by recent versions of the
     Linux Perf tool and view them in \QC. Select \uicontrol Analyze >
-    \uicontrol {Performance Analyzer Options} > \uicontrol {Load perf.data} to
-    load a file.
+    \uicontrol {Performance Analyzer Options} > \uicontrol {Load perf.data File}
+    to load a file.
 
     \image qtcreator-cpu-usage-analyzer-load-perf-trace.png