Attempt to give guidance on whitespace

Its not uncommon for me to want a blank line after the opening `{` of a method.

In scrolling through an (overly large) 2000 line class I can see no instances of blank line before the closing `}` of a method.

```
- (NSAttributedString *)aboutTermsAttributedString {
    
    NSDictionary *attributes = nil;
    NSError *error = nil;
    
    NSURL *fileURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"terms_of_use" ofType:@"html"]];
    NSAttributedString *attributedString = [[NSAttributedString alloc] initWithFileURL:fileURL options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: @(NSUTF8StringEncoding)}
                                                                    documentAttributes:&attributes error:&error];
    if (error) {
        NSLog(@"Error: unable to load about mobile string. %@", [error localizedDescription]);
        return nil;
    }
    
    return attributedString;
}
```