Fix typos in JPA Query Methods documentation

[yybmion]

Hi team, This PR fixes two typos in the JPA Query Methods documentation.

1. Corrected "retuning" to "returning" in the section about native queries

spring-data-jpa/src/main/antora/modules/ROOT/pages/jpa/query-methods.adoc

Line 327 in dbd4e53

.Native query retuning raw column name/value pairs

2. Fixed inconsistent method name reference where "findAllByAttribute" was incorrectly referred to as "findByAllAttribute" in one instance

spring-data-jpa/src/main/antora/modules/ROOT/pages/jpa/query-methods.adoc

Line 509 in dbd4e53

If you now invoke `findByAllAttribute(…)` on `ConcreteRepository`, the query becomes `select t from ConcreteType t where t.attribute = ?1`.

Thank you.

[mp911de]

Thank you for your contribution. That's merged and backported now.