Fix flaky tests in DocumentTest

[219sansim]

Description

There are 2 tests in the DocumentTest.java class which call the DocumentTest.toString method, this method converts a Map object to a string, which is not in any particular order, the tests may pass or fail even though the code under test may be working as expected.
https://github.com/219sansim/jedis/blob/c1cc657e8b3a984aab8779f84aa0ff55c2b29118/src/main/java/redis/clients/jedis/search/Document.java#L23
To resolve the bug, I changed the code to check for both possible orderings.

Another possible fix could be to check if the string contains both the fields.

Reproduction of error

Run maven tests with NonDex tool

mvn edu.illinois:nondex-maven-plugin:2.1.1:nondex -Dtest=redis.clients.jedis.modules.search.DocumentTest#toStringTest
mvn edu.illinois:nondex-maven-plugin:2.1.1:nondex -Dtest=redis.clients.jedis.modules.search.DocumentTest#serialize

Error Output
Showing error output of test serialize

[ERROR] Failures: 
[ERROR]   DocumentTest.serialize:45 expected:<...: 10.0, properties:[[string=c, float=12.0]]> but was:<...: 10.0, properties:[[float=12.0, string=c]]>

After making the changes, the tests pass with NonDex tool