Spring-ai AzureVectorStore - Correct message grammar in the add method for a scenario when the document was not uploaded successfully

For a scenario when you are adding documents to the Azure AI Search Vector store (using the AzureVectorStore java implementation), I noticed when the document content is not loaded successfully a message of this nature could be thrown
"Document with key 1 upload is not successfully". This sounds grammatically incorrect. So I have updated the message to "Document with key 1 did not upload successfully".

Exact change as follows -

for (IndexingResult indexingResult : result.getResults()) {
            Assert.isTrue(indexingResult.isSucceeded(),
                    String.format("Document with key %s did not upload successfully", indexingResult.getKey()));
        }

@pivotal-cla This is an Obvious Fix.