adding new Babel key sequences to the org refcard

* doc/orgcard.tex: adding new Babel key sequences to the org refcard

doc/orgcard.tex

@@ -480,8 +480,10 @@ formula, \kbd{:=} a field formula.
 \key{view expanded body of code block at point}{C-c C-v v}
 \key{go to named code block}{C-c C-v g}
 \key{go to named result}{C-c C-v r}
+\key{go to the head of the current code block}{C-c C-v u}
 \key{go to the next code block}{C-c C-v n}
 \key{go to the previous code block}{C-c C-v p}
+\key{execute the next key sequence in the code edit buffer}{C-c C-v x}
 \key{execute all code blocks in current buffer}{C-c C-v b}
 \key{execute all code blocks in current subtree}{C-c C-v s}
 \key{tangle code blocks in current file}{C-c C-v t}