Fix typos in code and documentation

See gh-31734

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/Restarter.java

@@ -327,7 +327,7 @@ public class Restarter {
 	}
 
 	private void cleanupKnownCaches() {
-		// Whilst not strictly necessary it helps to cleanup soft reference caches
+		// Whilst not strictly necessary it helps to clean up soft reference caches
 		// early rather than waiting for memory limits to be reached
 		ResolvableType.clearCache();
 		cleanCachedIntrospectionResultsCache();

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/restart/server/RestartServerTests.java

@@ -89,7 +89,7 @@ class RestartServerTests {
 	@Test
 	void updateReplacesLocalFilesWhenPossible(@TempDir File directory) throws Exception {
 		// This is critical for Cloud Foundry support where the application is
-		// run exploded and resources can be found from the servlet root (outside of the
+		// run exploded and resources can be found from the servlet root (outside the
 		// classloader)
 		File classFile = new File(directory, "ClassA.class");
 		FileCopyUtils.copy("abc".getBytes(), classFile);