feat(Firestore): add sample for multiple inequality filters

[bshaffer]

• adds sample query_filter_compound_multi_ineq
• Removes now invalid samples query_filter_range_invalid and query_order_field_invalid

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 1 region tag.

- [firestore/src/query_filter_compound_multi_ineq.php:47](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/a2491ce18f59494b411c057f593b3b1bdb036da4/firestore/src/query_filter_compound_multi_ineq.php#L47), tag `firestore_query_filter_compound_multi_ineq`

You are about to delete 2 region tags.

- [firestore/src/query_filter_range_invalid.php:40](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/9160740eaf46b368cd44469a188189942dd7eb46/firestore/src/query_filter_range_invalid.php#L40), tag `firestore_query_filter_range_invalid` - [firestore/src/query_order_field_invalid.php:40](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/9160740eaf46b368cd44469a188189942dd7eb46/firestore/src/query_order_field_invalid.php#L40), tag `firestore_query_order_field_invalid`

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[clairekeer1997]

Hi Brent, this is Jia from Firestore queries team. Thanks for adding the examples for PHP! The example for Datastore looks good. But for FIrestore, this example query

        ->where('born', '>', 1900)
        ->where('born', '<', 1950);

only contains inequalities on a single field born. We need to have inequalities on different fields to be considered as a multiple inequalities query. For example, age > 20 AND height > 60 is a query with multiple inequalities.

[bshaffer]

@clairekeer1997 hi Jia. If you click the "Files Changed", you can see the actual sample. What you're referring to is not part of this sample, which looks like this:

    $chainedQuery = $collection
        ->where('age', '>', 35)
        ->where('height', '>', 60)
        ->where('height', '<', 70);

[clairekeer1997]

Sorry I read on the wrong one. The updated example looks good to me.