Update two of the \indexsubitem values to use singular rather than plural form
of "variable": each individual variable should be identified as a single
variable and not a collection in the index.
diff --git a/Doc/lib/libbasehttp.tex b/Doc/lib/libbasehttp.tex
index b9e2edb..1f7b6da 100644
--- a/Doc/lib/libbasehttp.tex
+++ b/Doc/lib/libbasehttp.tex
@@ -49,7 +49,7 @@
 the relevant information is stored into instance variables of the
 handler.
 
-\renewcommand{\indexsubitem}{(BaseHTTPRequestHandler instance variables)}
+\renewcommand{\indexsubitem}{(BaseHTTPRequestHandler instance variable)}
 
 \code{BaseHTTPRequestHandler} has the following instance variables:
 
@@ -88,7 +88,7 @@
 to this stream.
 \end{datadesc}
 
-\renewcommand{\indexsubitem}{(BaseHTTPRequestHandler class variables)}
+\renewcommand{\indexsubitem}{(BaseHTTPRequestHandler class variable)}
 
 \code{BaseHTTPRequestHandler} has the following class variables:
 
diff --git a/Doc/libbasehttp.tex b/Doc/libbasehttp.tex
index b9e2edb..1f7b6da 100644
--- a/Doc/libbasehttp.tex
+++ b/Doc/libbasehttp.tex
@@ -49,7 +49,7 @@
 the relevant information is stored into instance variables of the
 handler.
 
-\renewcommand{\indexsubitem}{(BaseHTTPRequestHandler instance variables)}
+\renewcommand{\indexsubitem}{(BaseHTTPRequestHandler instance variable)}
 
 \code{BaseHTTPRequestHandler} has the following instance variables:
 
@@ -88,7 +88,7 @@
 to this stream.
 \end{datadesc}
 
-\renewcommand{\indexsubitem}{(BaseHTTPRequestHandler class variables)}
+\renewcommand{\indexsubitem}{(BaseHTTPRequestHandler class variable)}
 
 \code{BaseHTTPRequestHandler} has the following class variables: