Adding more information about how to contribute guide

Author: bradleywell

How-To-Contribute.md

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 # Making a Correction
 
 This design guide is a living document, and can always be improved. If after testing a dimension or step in this guide, you find a better dimension or set of steps for a page in the guide, you can raise a github issue to change the dimension in the guide.

index.md

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 Many of the devices in the MMC library use the same components, but all use slightly different dimensions when adding the parts into the design. The designers frequently reference other, older designs that use the part for the correct dimensions to use, but there are so many different dimensions used that this leads to several different ‘standards’ being used across devices for the same part. This guide is an attempt to standardize the dimensions for parts across designs, and to serve as a central reference point for use designing devices. 
 
-In the first section, the guide covers the commonly used commercial parts in MMC designs, and how to integrate them into 3D printed components. This includes the right size holes to use for screws, the best ways to secure a switch to a component, and what size openings to use for various USB connectors. 
+In the Commercial Components section, the guide covers the commonly used commercial parts in MMC designs, and how to integrate them into 3D printed components. This includes the right size holes to use for screws, the best ways to secure a switch to a component, and what size openings to use for various USB connectors. 
 
-The second section covers common design elements used in MMC devices, such as 3D printed threads, cotter pins, and shadow lines. This section focuses less on exact measurements and dimensions than the previous section, as the designer has control over the dimensions of all the components involved. Instead this section focuses more on the necessary design considerations and minimum/maximum sizes of the features.
+The Design Elements for 3D Printed Parts section covers common design elements used in MMC devices, such as 3D printed threads, cotter pins, and shadow lines. This section focuses less on exact measurements and dimensions than the previous section, as the designer has control over the dimensions of all the components involved. Instead this section focuses more on the necessary design considerations and minimum/maximum sizes of the features.
 
-The third section of the guide is primarily a link to the Hydra Research Design Rules for basic 3D printing tips, such as wall thicknesses, overhangs, and filet sizes. It also breaks out the section on printing overhanging holes for easy reference, and gives a brief overview of the printers used in the design of the devices mentioned in the guide, and how that affected the tolerances used in the guide. It also covers how these tolerances can be changed for other 3D printers to make them fit better.  
+The 3D Printing Design Tips section of the guide links to other 3D printing design guides that cover wall thicknesses, overhangs, optimizing for print speed and material usage, and filet sizes while breaking out the section on printing overhanging holes from the Hydra Research design guide for easy reference. It also gives a brief overview of the printers used in the design of the devices mentioned in the guide, and how that affected the tolerances used in the guide. Finally, it covers how these tolerances can be changed for other 3D printers to make them fit better.
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+Finally, there is a How to Contribute section that covers how to make changes to the guide or add new sections. This is a living document and intended to be changed and updated as better measurements and new design techniques are used, both by the Makers Making Change team and community.
 
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