Scrubber sample code now handles tokens correctly that also appear by…

… their own.

When adding a token to the scrubber list like "two" that also exists as an individual term not just together with other tokens like "two sentences" the original code failed because the while loop consumed the whole span consisting of just one token. Fixed.

examples/sample.ipynb

@@ -556,7 +556,7 @@
     "@spacy.registry.misc(\"prefix_scrubber\")\n",
     "def prefix_scrubber():\n",
     "\tdef scrubber_func(span: Span) -> str:\n",
-    "\t\twhile span[0].text in (\"a\", \"the\", \"their\", \"every\", \"other\"):\n",
+    "\t\twhile len(span) > 1 and span[0].text in (\"a\", \"the\", \"their\", \"every\", \"other\"):\n",
     "\t\t\tspan = span[1:]\n",
     "\t\treturn span.text\n",
     "\treturn scrubber_func\n",