Fix typos

Closes gh-29364

Author: catmug

spring-r2dbc/src/main/java/org/springframework/r2dbc/core/DatabaseClient.java

@@ -144,7 +144,7 @@ interface Builder {
 		Builder apply(Consumer<Builder> builderConsumer);
 
 		/**
-		 * Builder the {@link DatabaseClient} instance.
+		 * Build the {@link DatabaseClient} instance.
 		 */
 		DatabaseClient build();
 	}

spring-webflux/src/main/java/org/springframework/web/reactive/function/client/WebClient.java

@@ -334,7 +334,7 @@ interface Builder {
 		Builder clone();
 
 		/**
-		 * Builder the {@link WebClient} instance.
+		 * Build the {@link WebClient} instance.
 		 */
 		WebClient build();
 	}

spring-webflux/src/main/java/org/springframework/web/reactive/result/view/Rendering.java

@@ -134,7 +134,7 @@ interface Builder<B extends Builder<B>> {
 		B headers(HttpHeaders headers);
 
 		/**
-		 * Builder the {@link Rendering} instance.
+		 * Build the {@link Rendering} instance.
 		 */
 		Rendering build();
 	}