Add whitespace to improve readability

Author: ngocnhan-tran1996

docs/modules/ROOT/pages/reactive/integrations/observability.adoc

@@ -291,5 +291,5 @@ Spring Security tracks the following spans on each request:
 7. `spring.security.authorizations` - a span that wraps authorization attempts
 
 [TIP]
-`spring.security.http.chains.before` + `spring.security.http.secured.requests` + `spring.security.http.chains.after` = `spring.security.http.requests`
+`spring.security.http.chains.before` + `spring.security.http.secured.requests` + `spring.security.http.chains.after` = `spring.security.http.requests` +
 `spring.security.http.chains.before` + `spring.security.http.chains.after` = Spring Security's part of the request

docs/modules/ROOT/pages/servlet/integrations/observability.adoc

@@ -296,5 +296,5 @@ Spring Security tracks the following spans on each request:
 7. `spring.security.authorizations` - a span that wraps authorization attempts
 
 [TIP]
-`spring.security.http.chains.before` + `spring.security.http.secured.requests` + `spring.security.http.chains.after` = `spring.security.http.requests`
+`spring.security.http.chains.before` + `spring.security.http.secured.requests` + `spring.security.http.chains.after` = `spring.security.http.requests` +
 `spring.security.http.chains.before` + `spring.security.http.chains.after` = Spring Security's part of the request