Remove a stray backtick in an error explanation.

nnethercote · nnethercote · commit f12e9357955c · 2024-05-13T07:53:38.000+10:00
diff --git a/compiler/rustc_error_codes/src/error_codes/E0457.md b/compiler/rustc_error_codes/src/error_codes/E0457.md
@@ -1,4 +1,4 @@
-#### Note: this error code is no longer emitted by the compiler`
+#### Note: this error code is no longer emitted by the compiler
 
 Plugin `..` only found in rlib format, but must be available in dylib format.
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		-#### Note: this error code is no longer emitted by the compiler`
	`1`	`+#### Note: this error code is no longer emitted by the compiler`
`2`	`2`
`3`	`3`	Plugin `..` only found in rlib format, but must be available in dylib format.
`4`	`4`