snippets and fix tests

Author: dlarocque

google-cloud-firestore/src/test/java/com/google/cloud/firestore/it/ITPipelineTest.java

@@ -1022,9 +1022,9 @@ public void testLTrim() throws Exception {
             .addFields(constant(Blob.fromBytes(new byte[] {0x00, 0x01, 0x02, 0x00, 0x00})).as("bytes"))
             .select(
                 ltrim("spacedTitle").as("ltrimmedTitle"),
-                field("userNameWithQuotes").ltrim("\"").as("userName"),
+                field("userNameWithQuotes").ltrimValue("\"").as("userName"),
                 field("bytes")
-                    .ltrim(constant(Blob.fromBytes(new byte[] {0x00})))
+                    .ltrimValue(constant(Blob.fromBytes(new byte[] {0x00})))
                     .as("bytes"))
             .limit(1)
             .execute()
@@ -1052,9 +1052,9 @@ public void testRTrim() throws Exception {
             .addFields(constant(Blob.fromBytes(new byte[] {0x00, 0x01, 0x02, 0x00, 0x00})).as("bytes"))
             .select(
                 rtrim("spacedTitle").as("rtrimmedTitle"),
-                field("userNameWithQuotes").rtrim("\"").as("userName"),
+                field("userNameWithQuotes").rtrimValue("\"").as("userName"),
                 field("bytes")
-                    .rtrim(constant(Blob.fromBytes(new byte[] {0x00})))
+                    .rtrimValue(constant(Blob.fromBytes(new byte[] {0x00})))
                     .as("bytes"))
             .limit(1)
             .execute()

samples/preview-snippets/src/main/java/com/example/firestore/PipelineSnippets.java

@@ -1391,7 +1391,6 @@ void strTrimFunction() throws ExecutionException, InterruptedException {
     // [END trim_function]
     System.out.println(result.getResults());
   }
-
   void unixMicrosToTimestampFunction() throws ExecutionException, InterruptedException {
     // [START unix_micros_timestamp]
     Pipeline.Snapshot result =