docs- fix rst link to yara.Rules match method
docs- fix rst link to yara.Rules match method

keyword for methods is `meth` - https://stackoverflow.com/questions/22700606/how-would-i-cross-reference-a-function-generated-by-autodoc-in-sphinx 

fixes #1307, #1308 regression
wxsBSD/yara,pombredanne/yara,cblichmann/yara,wxsBSD/yara,cblichmann/yara,VirusTotal/yara,hillu/yara,wxsBSD/yara,cblichmann/yara,pombredanne/yara,VirusTotal/yara,hillu/yara,VirusTotal/yara,pombredanne/yara,VirusTotal/yara,cblichmann/yara,pombredanne/yara,hillu/yara,VirusTotal/yara,cblichmann/yara,hillu/yara,wxsBSD/yara,wxsBSD/yara,pombredanne/yara,hillu/yara