Apply suggestions from code review

Co-authored-by: Jeremy Mikola <jmikola@gmail.com>

Author: GromNaN

src/GridFS/Exception/LogicException.php

@@ -44,7 +44,7 @@ public static function bucketAliasNotRegistered(string $alias): self
      */
     public static function invalidContext($context): self
     {
-        return new self(sprintf('The "gridfs" context option must be an "array" or "null". Got "%s".', get_debug_type($context)));
+        return new self(sprintf('Expected "gridfs" stream context to have type "array" but found "%s"', get_debug_type($context)));
     }
 
     /**
@@ -55,7 +55,7 @@ public static function invalidContext($context): self
      */
     public static function invalidContextCollectionWrapper($object): self
     {
-        return new self(sprintf('Context key "gridfs[collectionWrapper]" must be an instance of %s, %s given', CollectionWrapper::class, get_debug_type($object)));
+        return new self(sprintf('Expected "collectionWrapper" in "gridfs" stream context to have type "%s" but found "%s"', CollectionWrapper::class, get_debug_type($object)));
     }
 
     /**