Use latex sloppypar to fix monospace wrapping in PDF rendering.

Monospaced identifiers could end up running over if latex was not able to find a place to break the line. Using sloppypar forces breaks so monospaced identifiers don't run over or get broken up.

Also add vspace to admonitions so they have some separation from the prior text.

doc/lib/pgBackRestDoc/Common/DocRender.pm

@@ -110,7 +110,8 @@ my $oRenderTag =
         'backrest' => [undef, ''],
         'proper' => ['\textnormal{\texttt{', '}}'],
         'postgres' => ['PostgreSQL', ''],
-        'admonition' => ["\n\\begin{leftbar}\n\\textit{\\textbf{", "}\n\\end{leftbar}\n"],
+        'admonition' =>
+            ["\n\\vspace{.5em}\\begin{leftbar}\n\\begin{sloppypar}\\textit{\\textbf{", "}\\end{sloppypar}\n\\end{leftbar}\n"],
     },
 
     'html' =>