Add explicit link rule (#9089)

Signed-off-by: Fanit Kolchina <[email protected]>

.github/vale/styles/OpenSearch/LinksExplicit.yml

@@ -0,0 +1,8 @@
+extends: existence
+message: "In links, use '{{site.url}}{{site.baseurl}}' instead of 'https://www.opensearch.org/docs/latest'."
+level: error
+nonword: true
+scope: raw
+tokens:
+  - '\]\(https:\/\/www.opensearch.org\/docs\/latest'
+

.github/vale/tests/test-style-pos.md

@@ -38,6 +38,8 @@ This sentence tests [links end slash]({{site.url}}{{site.baseurl}}/opensearch).
 
 This sentence tests [links mid slash]({{site.url}}{{site.baseurl}}opensearch).
 
+This sentence tests [links explicit](https://www.opensearch.org/docs/latest/double-slash/).
+
 This sentence tests log-in as a noun. To login, we test this as a verb.
 
 To test merge conflicts, remove tick marks in `<<<<<<< HEAD`.

.vale.ini

@@ -38,6 +38,7 @@ OpenSearch.LatinismsSubstitution = YES
 OpenSearch.LinksDoubleParentheses = YES
 OpenSearch.LinksDoubleSlash = YES
 OpenSearch.LinksEndSlash = YES
+OpenSearch.LinksExplicit = YES
 OpenSearch.LinksMidSlash = YES
 OpenSearch.LoginNoun = YES
 OpenSearch.LoginVerb = YES