Update writingrules.rst - Reserved Words Table
Update writingrules.rst - Reserved Words Table

Update from commit 2e755ac broke Markdown rendering of table -- Reformatted
plusvic/yara,cblichmann/yara,hillu/yara,pombredanne/yara,plusvic/yara,pombredanne/yara,hillu/yara,VirusTotal/yara,wxsBSD/yara,pombredanne/yara,plusvic/yara,plusvic/yara,cblichmann/yara,cblichmann/yara,hillu/yara,plusvic/yara,wxsBSD/yara,hillu/yara,pombredanne/yara,cblichmann/yara,VirusTotal/yara,cblichmann/yara,VirusTotal/yara,wxsBSD/yara,VirusTotal/yara,wxsBSD/yara,VirusTotal/yara,hillu/yara,wxsBSD/yara,pombredanne/yara