fix test.

clarify doc comment

i now think the XTRIM documentation is saying that an entry at exactly MINID is kept.
https://redis.io/docs/latest/commands/xtrim/

Author: kijanawoodard

src/StackExchange.Redis/Interfaces/IDatabase.cs

@@ -2779,7 +2779,7 @@ IEnumerable<SortedSetEntry> SortedSetScan(
         /// Trim the stream to a specified minimum timestamp.
         /// </summary>
         /// <param name="key">The key of the stream.</param>
-        /// <param name="minId">All entries less than minId will be removed.</param>
+        /// <param name="minId">All entries with an id (timestamp) earlier minId will be removed.</param>
         /// <param name="flags">The flags to use for this operation.</param>
         /// <returns>The number of messages removed from the stream.</returns>
         /// <remarks><seealso href="https://redis.io/topics/streams-intro"/></remarks>

tests/StackExchange.Redis.Tests/StreamTests.cs

@@ -1932,7 +1932,7 @@ public void StreamTrimMinId()
         var numRemoved = db.StreamTrim(key, 1111111111, CommandFlags.None);
         var len = db.StreamLength(key);
 
-        Assert.Equal(2, numRemoved);
+        Assert.Equal(1, numRemoved);
         Assert.Equal(1, len);
     }