Remove LEMMA from exception examples [ci skip]

website/docs/api/tokenizer.md

@@ -118,8 +118,8 @@ and examples.
 > #### Example
 >
 > ```python
-> from spacy.attrs import ORTH, LEMMA
-> case = [{ORTH: "do"}, {ORTH: "n't", LEMMA: "not"}]
+> from spacy.attrs import ORTH, NORM
+> case = [{ORTH: "do"}, {ORTH: "n't", NORM: "not"}]
 > tokenizer.add_special_case("don't", case)
 > ```
 

website/docs/api/top-level.md

@@ -514,9 +514,9 @@ an error if key doesn't match `ORTH` values.
 >
 > ```python
 > BASE =  {"a.": [{ORTH: "a."}], ":)": [{ORTH: ":)"}]}
-> NEW = {"a.": [{ORTH: "a.", LEMMA: "all"}]}
+> NEW = {"a.": [{ORTH: "a.", NORM: "all"}]}
 > exceptions = util.update_exc(BASE, NEW)
-> # {"a.": [{ORTH: "a.", LEMMA: "all"}], ":)": [{ORTH: ":)"}]}
+> # {"a.": [{ORTH: "a.", NORM: "all"}], ":)": [{ORTH: ":)"}]}
 > ```
 
 | Name              | Type  | Description                                                     |

website/docs/usage/linguistic-features.md

@@ -649,7 +649,7 @@ import Tokenization101 from 'usage/101/\_tokenization.md'
 data in
 [`spacy/lang`](https://github.com/explosion/spaCy/tree/master/spacy/lang). The
 tokenizer exceptions define special cases like "don't" in English, which needs
-to be split into two tokens: `{ORTH: "do"}` and `{ORTH: "n't", LEMMA: "not"}`.
+to be split into two tokens: `{ORTH: "do"}` and `{ORTH: "n't", NORM: "not"}`.
 The prefixes, suffixes and infixes mostly define punctuation rules – for
 example, when to split off periods (at the end of a sentence), and when to leave
 tokens containing periods intact (abbreviations like "U.S.").