Fix PathVariable reference documentation code snippets

Closes gh-30243

Author: 1993heqiang

framework-docs/src/docs/asciidoc/web/webflux.adoc

@@ -1655,7 +1655,7 @@ content types that a controller method produces, as the following example shows:
 ----
 	@GetMapping("/pets/{petId}", produces = ["application/json"])
 	@ResponseBody
-	fun getPet(@PathVariable String petId): Pet {
+	fun getPet(@PathVariable petId: String): Pet {
 		// ...
 	}
 ----
@@ -1704,7 +1704,7 @@ You can also use the same with request header conditions, as the following examp
 [source,java,indent=0,subs="verbatim,quotes",role="primary"]
 .Java
 ----
-	@GetMapping(path = "/pets", headers = "myHeader=myValue") // <1>
+	@GetMapping(path = "/pets/{petId}", headers = "myHeader=myValue") // <1>
 	public void findPet(@PathVariable String petId) {
 		// ...
 	}
@@ -1714,7 +1714,7 @@ You can also use the same with request header conditions, as the following examp
 [source,kotlin,indent=0,subs="verbatim,quotes",role="secondary"]
 .Kotlin
 ----
-	@GetMapping("/pets", headers = ["myHeader=myValue"]) // <1>
+	@GetMapping("/pets/{petId}", headers = ["myHeader=myValue"]) // <1>
 	fun findPet(@PathVariable petId: String) {
 		// ...
 	}

framework-docs/src/docs/asciidoc/web/webmvc.adoc

@@ -1903,7 +1903,7 @@ You can also use the same with request header conditions, as the following examp
 [source,java,indent=0,subs="verbatim,quotes",role="primary"]
 .Java
 ----
-	@GetMapping(path = "/pets", headers = "myHeader=myValue") // <1>
+	@GetMapping(path = "/pets/{petId}", headers = "myHeader=myValue") // <1>
 	public void findPet(@PathVariable String petId) {
 		// ...
 	}
@@ -1913,7 +1913,7 @@ You can also use the same with request header conditions, as the following examp
 [source,kotlin,indent=0,subs="verbatim,quotes",role="secondary"]
 .Kotlin
 ----
-	@GetMapping("/pets", headers = ["myHeader=myValue"]) // <1>
+	@GetMapping("/pets/{petId}", headers = ["myHeader=myValue"]) // <1>
 	fun findPet(@PathVariable petId: String) {
 		// ...
 	}