DOCSP-19109 typo on createIndex page (#6011)

Author: Dave

source/reference/method/db.collection.createIndex.txt

@@ -160,7 +160,7 @@ creation of the index. Different index types can have additional
 options specific for that type.
 
 Multiple index options can be specified in the same document. However,
-if you specify mutiple option documents the :method:`db.collection.createIndex()`
+if you specify multiple option documents the :method:`db.collection.createIndex()`
 operation will fail.
 
 Consider the following :method:`db.collection.createIndex()` operation:

source/reference/method/db.collection.createIndexes.txt

@@ -162,7 +162,7 @@ creation of the indexes. Different index types can have additional
 options specific for that type.
 
 Multiple index options can be specified in the same document. However,
-if you specify mutiple option documents the :method:`db.collection.createIndexes()`
+if you specify multiple option documents the :method:`db.collection.createIndexes()`
 operation will fail.
 
 Consider the following :method:`db.collection.createIndexes()` operation: