Don't use ` in <summary>

Author: illicitonion

projects/output-and-error-handling/README.md

@@ -126,7 +126,7 @@ Or the same for `curl`:
 
 shows lots of very specific information:
 
-<details><summary>Click to expand the full output of the exit codes section of `man curl`</summary>
+<details><summary>Click to expand the full output of the exit codes section of <pre>man curl</pre></summary>
 <pre>
 EXIT CODES
        There are a bunch of different error codes and their corresponding error messages that may appear under error conditions. At the time of this writing, the exit codes are: