Correct fix for #420: get key_t param -> char []

(cherry picked from commit 491c31f)

Chap_API_Sharing_Basics.tex

@@ -429,14 +429,14 @@ \section{\code{PMIx_Get}}
 
 \copySignature{PMIx_Get}{1.0}{
 pmix_status_t \\
-PMIx_Get(const pmix_proc_t *proc, const pmix_key_t key, \\
+PMIx_Get(const pmix_proc_t *proc, const char key[], \\
 \hspace*{9\sigspace}const pmix_info_t info[], size_t ninfo, \\
 \hspace*{9\sigspace}pmix_value_t **val);
 }
 
 \begin{arglist}
 \argin{proc}{Process identifier - a \code{NULL} value may be used in place of the caller's ID (handle)}
-\argin{key}{Key to retrieve (\refstruct{pmix_key_t})}
+\argin{key}{Key to retrieve (string)}
 \argin{info}{Array of info structures (array of handles)}
 \argin{ninfo}{Number of elements in the \refarg{info} array (integer)}
 \argout{val}{value (handle)}
@@ -506,7 +506,7 @@ \subsection{\code{PMIx_Get_nb}}
 \cspecificstart
 \begin{codepar}
 pmix_status_t
-PMIx_Get_nb(const pmix_proc_t *proc, const pmix_key_t key,
+PMIx_Get_nb(const pmix_proc_t *proc, const char key[],
             const pmix_info_t info[], size_t ninfo,
             pmix_value_cbfunc_t cbfunc, void *cbdata);
 \end{codepar}

Chap_Revisions.tex

@@ -1472,7 +1472,7 @@ \subsection{Errata}
 The following errors were corrected in v5.1:
 
 \begin{compactitemize}
-  \item Parameter type for the key argument in \refapi{PMIx_Get_nb} has been changed to the equivalent type \refstruct{pmix_key_t} so that it is uniform with the argument in \refapi{PMIx_Get}.
+  \item Parameter type for the key argument in \refapi{PMIx_Get} has been changed from \refstruct{pmix_key_t} to \code{char []} so that it is uniform with the argument in \refapi{PMIx_Get_nb}.
 \end{compactitemize}
 
 \subsection{Added Functions (Provisional)}