PIP-0021: fix github flavor markdown inconsistency

PIP/PIP-0021.md

@@ -46,18 +46,18 @@ The following rules apply unless the context requires otherwise:
 > 
 > A clause structured as:
 > 
->     _50. Parent Clause Title_
->     _The XXX agree_
->         _50.1 to do UUU._ 
->         _50.2 to do VVV._  
->     _The YYY agree_
->         _50.3 to do ZZZ._
+>     _50. Parent Clause Title_  
+>     _The XXX agree_  
+>         _50.1 to do UUU._   
+>         _50.2 to do VVV._    
+>     _The YYY agree_   
+>         _50.3 to do ZZZ._    
 > 
 > shall be interpreted as:
 > 
->     _50.1 The XXX agree to do UUU._
->     _50.2 The XXX agree to do VVV._
->     _50.3 The YYY agree to do ZZZ._
+>     _50.1 The XXX agree to do UUU._   
+>     _50.2 The XXX agree to do VVV._   
+>     _50.3 The YYY agree to do ZZZ._   
 
 ## TERMS AND CONDITIONS