Can't use "let" twice on same variable (#102)

* Can't use "let" twice on same variable

Addresses: #98

* Fix wording

index.bs

@@ -104,15 +104,15 @@ To <dfn>open a bucket</dfn> for a |shelf| given a bucket |name| and optional |op
 
 1. If |options|["{{StorageBucketOptions/expires}}"] exists, then:
 
-    1. Let |expires| be |options|["{{StorageBucketOptions/expires}}"].
+    1. Set |expires| to |options|["{{StorageBucketOptions/expires}}"].
 
     1. If |expires| milliseconds after the [=Unix epoch=] is before the [=relevant settings object=]'s [=environment settings object/current wall time=], then return failure.
 
 1. Let |quota| be undefined.
 
 1. If |options|["{{StorageBucketOptions/quota}}"] exists, then:
 
-    1. Let |quota| be |options|["{{StorageBucketOptions/quota}}"].
+    1. Set |quota| to |options|["{{StorageBucketOptions/quota}}"].
 
     1. If |quota| is less than or equal to zero, then return failure.
 
@@ -128,7 +128,7 @@ To <dfn>open a bucket</dfn> for a |shelf| given a bucket |name| and optional |op
 
 1. If |bucket| is null, then:
 
-    1. Let |bucket| be a new [=/storage bucket=] with name |name|.
+    1. Set |bucket| to a new [=/storage bucket=] with name |name|.
 
     1. Set |bucket|'s [=StorageBucket/durability value=] to |options|["{{StorageBucketOptions/durability}}"] if it exists.