Fix grammatical errors in Javadoc

Closes spring-projectsgh-27298

spring-aop/src/main/java/org/aopalliance/intercept/Joinpoint.java

@@ -26,7 +26,7 @@
  * terminology).
  *
  * <p>A runtime joinpoint is an <i>event</i> that occurs on a static
- * joinpoint (i.e. a location in a the program). For instance, an
+ * joinpoint (i.e. a location in a program). For instance, an
  * invocation is the runtime joinpoint on a method (static joinpoint).
  * The static part of a given joinpoint can be generically retrieved
  * using the {@link #getStaticPart()} method.

spring-web/src/main/java/org/springframework/web/util/UrlPathHelper.java

@@ -190,7 +190,7 @@ private void checkReadOnly() {
 
 	/**
 	 * {@link #getLookupPathForRequest Resolve} the lookupPath and cache it in a
-	 * a request attribute with the key {@link #PATH_ATTRIBUTE} for subsequent
+	 * request attribute with the key {@link #PATH_ATTRIBUTE} for subsequent
 	 * access via {@link #getResolvedLookupPath(ServletRequest)}.
 	 * @param request the current request
 	 * @return the resolved path

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RequestPredicate.java

@@ -71,7 +71,7 @@ default RequestPredicate or(RequestPredicate other) {
 
 	/**
 	 * Transform the given request into a request used for a nested route. For instance,
-	 * a path-based predicate can return a {@code ServerRequest} with a the path remaining
+	 * a path-based predicate can return a {@code ServerRequest} with a path remaining
 	 * after a match.
 	 * <p>The default implementation returns an {@code Optional} wrapping the given request if
 	 * {@link #test(ServerRequest)} evaluates to {@code true}; or {@link Optional#empty()}

spring-webmvc/src/main/java/org/springframework/web/servlet/function/RequestPredicate.java

@@ -71,7 +71,7 @@ default RequestPredicate or(RequestPredicate other) {
 
 	/**
 	 * Transform the given request into a request used for a nested route. For instance,
-	 * a path-based predicate can return a {@code ServerRequest} with a the path remaining
+	 * a path-based predicate can return a {@code ServerRequest} with a path remaining
 	 * after a match.
 	 * <p>The default implementation returns an {@code Optional} wrapping the given request if
 	 * {@link #test(ServerRequest)} evaluates to {@code true}; or {@link Optional#empty()}

spring-websocket/src/main/java/org/springframework/web/socket/adapter/standard/ConvertingEncoderDecoderSupport.java

@@ -183,7 +183,7 @@ public boolean willDecode(M bytes) {
 	}
 
 	/**
-	 * Decode the a message into an object.
+	 * Decode the message into an object.
 	 * @see javax.websocket.Decoder.Text#decode(String)
 	 * @see javax.websocket.Decoder.Binary#decode(ByteBuffer)
 	 */