Mark section headers with backport from v5 where relevant

Author: abouteiller

Chap_Revisions.tex

@@ -1553,7 +1553,7 @@ \subsection{Added Attributes (Provisional, backport from v5.0)}
 \pasteAttributeItem{PMIX_IOF_OUTPUT_TO_DIRECTORY}
 \pasteAttributeItem{PMIX_IOF_OUTPUT_TO_FILE}
 
-\subsection{Deprecated constants}
+\subsection{Deprecated constants (backport from v5.0)}
 
 The following constants were deprecated in v4.2 (backport from v5.0):
 
@@ -1564,7 +1564,7 @@ \subsection{Deprecated constants}
 %
 \end{constantdesc}
 
-\subsection{Deprecated attributes}
+\subsection{Deprecated attributes (backport from v5.0)}
 
 The following attributes were deprecated in v4.2 (backport from v5.0):
 
@@ -1573,7 +1573,7 @@ \subsection{Deprecated attributes}
 Renamed to \refattr{PMIX_DEBUG_STOP_IN_APP}
 }
 
-\subsection{Deprecated macros}
+\subsection{Deprecated macros (backport from v5.0)}
 
 The following macros were deprecated in v4.2 (backport from v5.0):
 
@@ -1597,7 +1597,7 @@ \subsection{Deprecated macros}
 \section{Version 5.1: TBD}
 
 The v5.1 update succeeds the v5.0 document.
-Some changes were first introduced in the v4.2 document, but were not present in v5.0 document;
+Some changes were first introduced in the v4.2 document, but were not present in the v5.0 document;
 All such changes are part of the v5.1 update and are noted in the rest of this section.
 The v5.1 update includes the following changes from the v5.0 document: