export back-ends: Apply line break changes

* contrib/lisp/org-e-html.el (org-e-html-line-break): Apply line break
  changes.
* contrib/lisp/org-e-latex.el (org-e-latex-line-break): Apply line
  break changes.
* contrib/lisp/org-e-texinfo.el (org-e-texinfo-line-break): Apply line
  break changes.
* contrib/lisp/org-md.el (org-md-line-break): Apply line break
  changes.

contrib/lisp/org-e-html.el

@@ -2032,7 +2032,7 @@ CONTENTS is nil.  INFO is a plist holding contextual information."
 (defun org-e-html-line-break (line-break contents info)
   "Transcode a LINE-BREAK object from Org to HTML.
 CONTENTS is nil.  INFO is a plist holding contextual information."
-  "<br/>")
+  "<br/>\n")
 
 
 ;;;; Link

contrib/lisp/org-e-latex.el

@@ -1714,7 +1714,7 @@ CONTENTS is nil.  INFO is a plist holding contextual information."
 (defun org-e-latex-line-break (line-break contents info)
   "Transcode a LINE-BREAK object from Org to LaTeX.
 CONTENTS is nil.  INFO is a plist holding contextual information."
-  "\\\\")
+  "\\\\\n")
 
 
 ;;;; Link

contrib/lisp/org-e-texinfo.el

@@ -1162,7 +1162,7 @@ CONTENTS is nil.  INFO is a plist holding contextual information."
 (defun org-e-texinfo-line-break (line-break contents info)
   "Transcode a LINE-BREAK object from Org to Texinfo.
 CONTENTS is nil.  INFO is a plist holding contextual information."
-  "@*")
+  "@*\n")
 
 ;;; Link
 

contrib/lisp/org-md.el

@@ -248,7 +248,7 @@ a communication channel."
   "Transcode LINE-BREAK object into Markdown format.
 CONTENTS is nil.  INFO is a plist used as a communication
 channel."
-  "  ")
+  "  \n")
 
 
 ;;;; Link