Update docs/ABI/RegisterUsage.md

johnno1962 · xwu · web-flow · commit 07750f5e1d24 · 2019-05-31T06:15:07.000+01:00
Co-Authored-By: Xiaodi Wu &lt;xiaodi.wu@gmail.com&gt;
diff --git a/docs/ABI/RegisterUsage.md b/docs/ABI/RegisterUsage.md
@@ -1,4 +1,4 @@
-## 64 bit Architecture Register Usage
+## 64-Bit Architecture Register Usage
 
 From Swift 5, the calling convention register allocation for 64-bit architectures is largely based on [existing](https://developer.apple.com/library/content/documentation/Xcode/Conceptual/iPhoneOSABIReference/Articles/ARM64FunctionCallingConventions.html) [standards](https://developer.apple.com/library/content/documentation/DeveloperTools/Conceptual/LowLevelABI/140-x86-64_Function_Calling_Conventions/x86_64.html), with the addition of the context and error return registers discussed in the [ABI stability manifesto](https://github.com/apple/swift/blob/master/docs/ABIStabilityManifesto.md):
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-## 64 bit Architecture Register Usage`
	`1`	`+## 64-Bit Architecture Register Usage`
`2`	`2`
`3`	`3`	From Swift 5, the calling convention register allocation for 64-bit architectures is largely based on [existing](https://developer.apple.com/library/content/documentation/Xcode/Conceptual/iPhoneOSABIReference/Articles/ARM64FunctionCallingConventions.html) [standards](https://developer.apple.com/library/content/documentation/DeveloperTools/Conceptual/LowLevelABI/140-x86-64_Function_Calling_Conventions/x86_64.html), with the addition of the context and error return registers discussed in the [ABI stability manifesto](https://github.com/apple/swift/blob/master/docs/ABIStabilityManifesto.md):
`4`	`4`