orgcard: Update binding for org-columns-insert-dblock

As of 34b71a0ca (Add a dispatcher command for inserting dynamic
blocks, 2018-12-23), the binding was removed and the command is
available via org-dynamic-block-insert-dblock.

doc/orgcard.tex

@@ -513,7 +513,7 @@ after  ``{\tt :}'', and dictionary words elsewhere.
 \key{special commands in property lines}{C-c C-c}
 \key{next/previous allowed value}{S-LEFT/RIGHT}
 \key{turn on column view}{C-c C-x C-c}
-\key{capture columns view in dynamic block}{C-c C-x i}
+\key{capture columns view in dynamic block}{C-c C-x x}
 
 \key{quit column view}{q}
 \key{show full value}{v}
@@ -556,7 +556,7 @@ after  ``{\tt :}'', and dictionary words elsewhere.
 \key{stop/cancel clock on current item}{C-c C-x C-o/x}
 \key{display total subtree times}{C-c C-x C-d}
 \key{remove displayed times}{C-c C-c}
-\key{insert/update table with clock report}{C-c C-x C-r}
+\key{insert/update table with clock report}{C-c C-x C-x}
 
 \section{Agenda Views}