Merge pull request #917 from pmsjt/patch-5

Array of unwind codes is described in section 3, not 4.

Author: Colin Robertson

docs/build/arm64-exception-handling.md

@@ -217,7 +217,7 @@ This data is broken into four sections:
 
       2. If **E** is set to 1, then this field specifies the index of the first unwind code that describes the one and only epilog.
 
-   f. **Code Words** is a 5-bit field that specifies the number of 32-bit words needed to contain all of the unwind codes in section 4. If more than 31 words are required (i.e., more than 124 unwind code bytes), then this field must be set to 0 to indicate that an extension word is required.
+   f. **Code Words** is a 5-bit field that specifies the number of 32-bit words needed to contain all of the unwind codes in section 3. If more than 31 words are required (i.e., more than 124 unwind code bytes), then this field must be set to 0 to indicate that an extension word is required.
 
    g. **Extended Epilog Count** and **Extended Code Words** are 16-bit and 8-bit fields, respectively, that provide more space for encoding an unusually large number of epilogs or an unusually large number of unwind code words. The extension word containing these fields is only present if both the **Epilog Count** and **Code Words** fields in the first header word are set to 0.