Update capi.rst (#853)
Update capi.rst (#853)

Although the description is technically not wrong as yr_rules_save_stream never returns an error anyway, fwrite would not adhere to this rule.
VirusTotal/yara,hillu/yara,cblichmann/yara,wxsBSD/yara,cblichmann/yara,hillu/yara,cblichmann/yara,wxsBSD/yara,pombredanne/yara,pombredanne/yara,cblichmann/yara,plusvic/yara,plusvic/yara,VirusTotal/yara,pombredanne/yara,plusvic/yara,plusvic/yara,hillu/yara,VirusTotal/yara,pombredanne/yara,wxsBSD/yara,plusvic/yara,pombredanne/yara,cblichmann/yara,VirusTotal/yara,hillu/yara,hillu/yara,wxsBSD/yara,wxsBSD/yara,VirusTotal/yara