Fixed the help text to be code blocks

tools/dnsenum.md

@@ -5,6 +5,7 @@ Notes
 
 Help Text
 -------
+```
 Usage: dnsenum.pl [Options] <domain> 
 [Options]:
 Note: the brute force -f switch is obligatory.
@@ -41,6 +42,7 @@ REVERSE LOOKUP OPTIONS:
 			Exclude PTR records that match the regexp expression from reverse lookup results, useful on invalid hostnames.
 OUTPUT OPTIONS:
   -o --output <file>	Output in XML format. Can be imported in MagicTree (www.gremwell.com)
+```
 
 Example Usage
 -------

tools/dnsmap.md

@@ -5,6 +5,7 @@ Notes
 
 Help Text
 -------
+```
 dnsmap 0.30 - DNS Network Mapper by pagvac (gnucitizen.org)
 
 usage: dnsmap <target-domain> [options]
@@ -14,6 +15,7 @@ options:
 -c <csv-results-file>
 -d <delay-millisecs>
 -i <ips-to-ignore> (useful if you're obtaining false positives)
+```
 
 Example Usage
 -------

tools/dnsrecon.md

@@ -5,6 +5,7 @@ Notes
 
 Help Text
 -------
+```
 Version: 0.8.1
 Usage: dnsrecon.py <options>
 
@@ -62,6 +63,7 @@ Options:
    --xml              <file>   XML File to save found records.
    -c, --csv          <file>   Comma separated value file.
    -v                          Show attempts in the bruteforce modes.
+```
 
 Example Usage
 -------