Update rule BR_G102: Obtain REF_BLOCK by number only, rm hash constraint

Update rule BR_G102: Obtaining the REF_BLOCK by number only (removal of the constraint on hash).

rfc/0010_Duniter_Blockchain_Protocol_V12.md

@@ -2334,13 +2334,13 @@ EndIf
 
 For each ENTRY in local SINDEX where `op = 'UPDATE'`:
 
-    REF_BLOCK = HEAD~<HEAD~1.number + 1 - NUMBER(ENTRY.hash)>[hash=HASH(ENTRY.created_on)]
+    REF_BLOCK = HEAD~<HEAD~1.number + 1 - NUMBER(ENTRY.created_on)>
     
 If `HEAD.number == 0 && ENTRY.created_on == '0-E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855'`:
     
     ENTRY.age = 0
     
-Else if `REF_BLOC != null`:
+Else if `REF_BLOCK != null`:
 
     ENTRY.age = HEAD~1.medianTime - REF_BLOCK.medianTime