Merge pull request #167 from hanton/fix_document_typos

Fix several document typos.
diff --git a/Docs/MoltenVK_Runtime_UserGuide.md b/Docs/MoltenVK_Runtime_UserGuide.md
index fc1e72e..e138d37 100644
--- a/Docs/MoltenVK_Runtime_UserGuide.md
+++ b/Docs/MoltenVK_Runtime_UserGuide.md
@@ -258,7 +258,7 @@
 
 where `HEADER_FILE` is one of the following:
 
-- `vk_mvk_moltenvk.h` - Contains declarations and documenation for the functions, structures, 
+- `vk_mvk_moltenvk.h` - Contains declarations and documentation for the functions, structures, 
   and enumerations that define the behaviour of the `VK_MVK_moltenvk` *Vulkan* extension.
 
 - `mvk_vulkan.h` - This is a convenience header file that loads the `vulkan.h` header file
@@ -305,7 +305,7 @@
   function, you are indicating that the remainder of the *SPIR-V* stream contains either
   *MSL* source code, or *MSL* compiled code, respectively.
 
-  You can use the `MoltenVKShaderConverter` command-line tool found in this **MoltenVK** distribution 
+- You can use the `MoltenVKShaderConverter` command-line tool found in this **MoltenVK** distribution 
   package to convert your *SPIR-V* shaders to *MSL* source code, offline at development time,
   in order to create the appropriate *MSL* code to load at runtime. The [section below](#shaders)
   discusses how to use this tool in more detail.
diff --git a/ExternalRevisions/README.md b/ExternalRevisions/README.md
index f91a43a..bbb1df7 100644
--- a/ExternalRevisions/README.md
+++ b/ExternalRevisions/README.md
@@ -83,7 +83,7 @@
 Once you have made changes, you can retrieve the updated library versions by running
 the `fetchDependencies` script again.
 
->***Note:*** If, after updating to new verions of the external libraries, you encounter 
+>***Note:*** If, after updating to new versions of the external libraries, you encounter 
 >build errors when building **MoltenVK**, review the instructions in the sections below 
 >to ensure all necessary external library files are included in the **MoltenVK** builds.
 
diff --git a/README.md b/README.md
index 5a3a86f..a103621 100644
--- a/README.md
+++ b/README.md
@@ -212,7 +212,7 @@
 **MoltenVK** is a key component of the [*Khronos Vulkan Portability Initiative*](https://www.khronos.org/vulkan/portability-initiative), 
 whose intention is to provide specifications, resources, and tools to allow developers to understand and design 
 their *Vulkan* apps for maximum cross-platform compatibility and portability, including on platforms, such as 
-*macOS* and *iOS*, where a native *Vulkan* driver is not avaialble. 
+*macOS* and *iOS*, where a native *Vulkan* driver is not available. 
 
 
 
@@ -242,5 +242,5 @@
 
 ### Code Formatting
 
-When contirbuting code, please honour the code formatting style found in existing **MoltenVK** source code.
+When contributing code, please honour the code formatting style found in existing **MoltenVK** source code.
 In future, this will formally be enforced using `clang-format`.