Fix typos, formatting and escaping in reference

Note: Some symbol combinations (including <=) serve as textual symbol
replacements in AsciiDoc.

http://asciidoctor.org/docs/asciidoc-syntax-quick-reference/#text-replacement

spring-beans/src/main/java/org/springframework/beans/factory/annotation/Lookup.java

@@ -46,7 +46,7 @@ import java.lang.annotation.Target;
  * beans, provide stub implementations of your lookup methods to be able to declare
  * them as concrete classes. And please remember that lookup methods won't work on
  * beans returned from {@code @Bean} methods in configuration classes; you'll have
- * to resort to {@code @Inject Provider<TargetBean>} or the like instead.
+ * to resort to {@code @Inject Provider<TargetBean>} or the like instead.
  *
  * @author Juergen Hoeller
  * @since 4.1