Add Sprig functions to GRC template doc (stolostron#6417)

ref: https://issues.redhat.com/browse/ACM-11548

Signed-off-by: Dale Haiducek <[email protected]>

Author: dhaiducek

governance/template_functions.adoc

@@ -495,7 +495,7 @@ Additionally, {product-title-short} supports the following template functions th
 | `default`, `empty`, `fromJson`, `mustFromJson`, `ternary`, `toJson`, `toRawJson` 
 
 | Dictionaries and dict
-| `dig` 
+| `dict`, `dig`, `get`, `hasKey`, `merge`, `mustMerge`, `set`, `unset`
 
 | Integer math
 | `add`, `mul`, `div`, `round`, `sub` 
@@ -507,7 +507,7 @@ Additionally, {product-title-short} supports the following template functions th
 | `append`, `concat`, `has`, `list`, `mustAppend`, `mustHas`, `mustPrepend`, `mustSlice`, `prepend`, `slice` 
 
 | String functions
-| `cat`, `contains`, `hasPrefix`, `hasSuffix`, `join`, `lower`, `quote`, `replace`, `split`, `splitn`, `substr`, `trim`, `trimAll`, `trunc`, `upper`
+| `cat`, `contains`, `hasPrefix`, `hasSuffix`, `join`, `lower`, `mustRegexFind`, `mustRegexFindAll`, `mustRegexMatch`, `quote`, `regexFind`, `regexFindAll`, `regexMatch`, `regexQuoteMeta`, `replace`, `split`, `splitn`, `substr`, `trim`, `trimAll`, `trunc`, `upper`
 
 | Version comparison
 | `semver`, `semverCompare`