Change hypertarget captions to empty strings

Paper.tex

@@ -876,7 +876,7 @@ \subsection{Execution Environment}
 \item $I_s$, the address of the account which caused the code to be executing; if the execution agent is a transaction, this would be the transaction sender.\hypertarget{Wei_value_exec}{}
 \item $I_v$, the value, in Wei, passed to this account as part of the same procedure as execution; if the execution agent is a transaction, this would be the transaction value.\hypertarget{exec_machine_code_I__b}{}
 \item $I_\mathbf{b}$, the byte array that is the machine code to be executed.\hypertarget{exec_block_header_I__H}{}
-\item $I_H$, the block header of the present block.\hypertarget{exec_call_or_create_depth_I__e}{exec_call_or_create_depth_I__e}
+\item $I_H$, the block header of the present block.\hypertarget{exec_call_or_create_depth_I__e}{}
 \item $I_e$, the depth of the present message-call or contract-creation (i.e. the number of {\small CALL}s or {\small CREATE}s being executed at present).\hypertarget{exec_permission_to_modify_state_I__w}{}
 \item $I_w$, the permission to make modifications to the state.
 \end{itemize}