[DOCS] Use keyword tokenizer in word delimiter graph examples (#53384)

In a tip admonition, we recommend using the `keyword` tokenizer with the
`word_delimiter_graph` token filter. However, we only use the
`whitespace` tokenizer in the example snippets. This updates those
snippets to use the `keyword` tokenizer instead.

Also corrects several spacing issues for arrays in these docs.

docs/reference/analysis/tokenfilters/word-delimiter-graph-tokenfilter.asciidoc

@@ -40,16 +40,16 @@ hyphens, we recommend using the
 ==== Example
 
 The following <<indices-analyze,analyze API>> request uses the
-`word_delimiter_graph` filter to split `Neil's Super-Duper-XL500--42+AutoCoder`
+`word_delimiter_graph` filter to split `Neil's-Super-Duper-XL500--42+AutoCoder`
 into normalized tokens using the filter's default rules:
 
 [source,console]
 ----
 GET /_analyze
 {
-  "tokenizer": "whitespace",
+  "tokenizer": "keyword",
   "filter": [ "word_delimiter_graph" ],
-  "text": "Neil's Super-Duper-XL500--42+AutoCoder"
+  "text": "Neil's-Super-Duper-XL500--42+AutoCoder"
 }
 ----
 
@@ -141,7 +141,7 @@ PUT /my_index
     "analysis": {
       "analyzer": {
         "my_analyzer": {
-          "tokenizer": "whitespace",
+          "tokenizer": "keyword",
           "filter": [ "word_delimiter_graph" ]
         }
       }
@@ -277,8 +277,8 @@ Defaults to `true`.
 (Optional, boolean)
 If `true`, the filter includes the original version of any split tokens in the
 output. This original version includes non-alphanumeric delimiters. For example:
-`super-duper-xl-500` -> [**`super-duper-xl-500`**, `super`, `duper`, `xl`, `500`
-]. Defaults to `false`.
+`super-duper-xl-500` -> [ **`super-duper-xl-500`**, `super`, `duper`, `xl`,
+`500` ]. Defaults to `false`.
 
 [WARNING]
 ====
@@ -319,7 +319,7 @@ If `true`, the filter splits tokens at letter-number transitions. For example:
 `stem_english_possessive`::
 (Optional, boolean)
 If `true`, the filter removes the English possessive (`'s`) from the end of each
-token. For example: `O'Neil's` -> `[ `O`, `Neil` ]. Defaults to `true`.
+token. For example: `O'Neil's` -> [ `O`, `Neil` ]. Defaults to `true`.
 
 `type_table`::
 +
@@ -408,7 +408,7 @@ PUT /my_index
     "analysis": {
       "analyzer": {
         "my_analyzer": {
-          "tokenizer": "whitespace",
+          "tokenizer": "keyword",
           "filter": [ "my_custom_word_delimiter_graph_filter" ]
         }
       },