False positive detections from license-intro_59.RULE and unknown_55.RULE

In a recent scan of README.dom.txt in xml-apis-ext-1.3.04.jar the results reported unknown-license-reference and unknown based on very small fragments of text in line 8

`the DOM in this repository are distributed under the license `

but the whole context of the text clearly points to license w3c

```
All of the .java software and associated documentation about
the DOM in this repository are distributed under the license
from the W3C, which is provided herein.
```

In fact, the w3c license is correctly detected in the scan results, but the two unknown detections are misleading and erroneous. This problem can probably be addressed by a new RULE.

[README.dom.txt.zip](https://github.com/nexB/scancode-toolkit/files/11356577/README.dom.txt.zip)

[xml-apis-ext-1.3.04.jar-extract-scan-results.json.zip](https://github.com/nexB/scancode-toolkit/files/11356579/xml-apis-ext-1.3.04.jar-extract-scan-results.json.zip)