LaTeX: remove extra space after author on title page in PDF

Closes: #6004

Comment: \begin{tabular}[@{}c@{}] does not work in case of multiple
authors separated by \and in latex_documents, because latex has this
definition of \and :

macro:->\end {tabular}\hskip 1em \@plus .17fil\begin {tabular}[t]{c}

which means we would need to modify it to read

macro:->\end {tabular}\hskip 1em \@plus .17fil\begin {tabular}[t]{@{}c@{}}

(or only one @{} at end) modifying space between two authors.

CHANGES

@@ -16,6 +16,8 @@ Features added
 Bugs fixed
 ----------
 
+* LaTeX: Remove extraneous space after author names on PDF title page (refs: #6004)
+
 Testing
 --------
 

sphinx/texinputs/sphinxhowto.cls

@@ -46,7 +46,7 @@
     {\Large
       \begin{tabular}[t]{c}
         \@author
-      \end{tabular}}\par
+      \end{tabular}\kern-\tabcolsep}\par
     \vspace{25pt}
     \@date \par
     \py@authoraddress \par

sphinx/texinputs/sphinxmanual.cls

@@ -55,7 +55,7 @@
       {\LARGE
         \begin{tabular}[t]{c}
           \@author
-        \end{tabular}
+        \end{tabular}\kern-\tabcolsep
         \par}
       \vfill\vfill
       {\large