Merge pull request typesense#41 from OLIOEX/documents-truncate-example-correction

[Example] Correct truncate a collection example

Author: jasonbosco

examples/collections_and_documents.rb

@@ -147,8 +147,8 @@
 
 ###
 # Truncate a collection
-#   Deletion returns the number of documents deleted
-collection = @typesense.collections['companies'].truncate
+#   Truncation returns the number of documents deleted
+collection = @typesense.collections['companies'].documents.truncate
 ap collection
 
 # {