Remove adverbs of time rule (#6323)

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

.github/vale/styles/OpenSearch/AdverbsOfTime.yml

@@ -1,8 +0,0 @@
-extends: existence
-message: "Don't use a comma after single-word adverbs of time at the beginning of a sentence in '%s'."
-link: https://github.com/opensearch-project/documentation-website/blob/main/STYLE_GUIDE.md#punctuation-and-capitalization
-level: error
-ignorecase: false
-nonword: true
-tokens:
-  - '(?:(^|\s)(Then|Afterward|Later|Subsequently)),'

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

@@ -2,8 +2,6 @@
 
 This sentence tests Advanced Placement (AP). We should define AP before using.
 
-Then this sentence tests adverbs of time.
-
 This sentence tests cybersecurity.
 
 This sentence tests dash---spacing.

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

@@ -2,8 +2,6 @@
 
 This sentence tests AP. AP should be defined before using.
 
-Then, this sentence tests adverbs of time.
-
 This sentence tests cyber security.
 
 This sentence tests dash --- spacing.

.vale.ini

@@ -19,7 +19,6 @@ Vale.Spelling = NO
 Vale.Repetition = NO
 Vale.Terms = YES
 OpenSearch.AcronymParentheses = YES
-OpenSearch.AdverbsOfTime = YES
 OpenSearch.Ampersand = YES
 OpenSearch.Cyber = YES
 OpenSearch.DashSpacing = YES