Set a predefined image width in debug-coroutines-with-idea.md (#4377)

Author: LiYing2010

docs/topics/debug-coroutines-with-idea.md

@@ -108,12 +108,12 @@ Using IntelliJ IDEA debugger, you can dig deeper into each coroutine to debug yo
 
 If you use `suspend` functions, in the debugger, you might see the "was optimized out" text next to a variable's name:
 
-![Variable "a" was optimized out](variable-optimised-out.png)
+![Variable "a" was optimized out](variable-optimised-out.png){width=480}
 
 This text means that the variable's lifetime was decreased, and the variable doesn't exist anymore.
 It is difficult to debug code with optimized variables because you don't see their values.
 You can disable this behavior with the `-Xdebug` compiler option.
 
 > __Never use this flag in production__: `-Xdebug` can [cause memory leaks](https://youtrack.jetbrains.com/issue/KT-48678/Coroutine-debugger-disable-was-optimised-out-compiler-feature#focus=Comments-27-6015585.0-0).
 >
-{style="warning"}
+{style="warning"}