Spelling update

updated submiting to submitting

Author: DocAdam

docs/docs/api-ref.md

@@ -30,7 +30,7 @@ Saves any changes to the workbook to the existing file.
 `Workbook.save_as(self, new_filename):`
 Saves any changes to the workbook to a new file specified by the `new_file` parameter.
 
-**Properities:**
+**Properties:**
 
 `self.worksheets:` Returns a list of worksheets found in the workbook.
 
@@ -56,7 +56,7 @@ The Connection class represents a tableau data connection. It can be from any ty
 
 **Methods:**
 
-**Properities:**
+**Properties:**
 
 `self.server:` Returns a string containing the server.
 

docs/docs/contributing.md

@@ -21,7 +21,7 @@ a feature do not require the CLA.
 
 To submit an issue/bug report, or to request a feature, please submit a [github issue](https://github.com/tableau/document-api-python/issues) to the repo.
 
-If you are submiting a bug report, please provide as much information as you can, including clear and concise repro steps, attaching any necessary
+If you are submitting a bug report, please provide as much information as you can, including clear and concise repro steps, attaching any necessary
 files to assist in the repro.  **Be sure to scrub the files of any potentially sensitive information.  Issues are public.**
 
 For a feature request, please try to describe the scenario you are trying to accomplish that requires the feature.  This will help us understand