remove colon suffix in comment-spacings rule (#981)

RULES_DESCRIPTIONS.md

@@ -183,14 +183,15 @@ _Description_: Spots comments of the form:
 _Configuration_: ([]string) list of exceptions. For example, to accept comments of the form
 ```go
 //mypragma: activate something
+//+optional
 ```
-You need to add `"mypragma"` in the configuration
+You need to add both `"mypragma:"` and `"+optional"` in the configuration
 
 Example:
 
 ```toml
 [rule.comment-spacings]
-  arguments =["mypragma","otherpragma"]
+  arguments =["mypragma:", "+optional"]
 ```
 ## confusing-naming
 

rule/comment-spacings.go

@@ -31,7 +31,7 @@ func (r *CommentSpacingsRule) configure(arguments lint.Arguments) {
 			if !ok {
 				panic(fmt.Sprintf("invalid argument %v for %s; expected string but got %T", arg, r.Name(), arg))
 			}
-			r.allowList = append(r.allowList, `//`+allow+`:`)
+			r.allowList = append(r.allowList, `//`+allow)
 		}
 	}
 }

test/comment-spacings_test.go

@@ -9,6 +9,6 @@ import (
 
 func TestCommentSpacings(t *testing.T) {
 	testRule(t, "comment-spacings", &rule.CommentSpacingsRule{}, &lint.RuleConfig{
-		Arguments: []any{"myOwnDirective"}},
+		Arguments: []any{"myOwnDirective:", "+optional"}},
 	)
 }

testdata/comment-spacings.go

@@ -42,3 +42,8 @@ Should be valid
 
 //nolint:staticcheck // nolint should be in the default list of acceptable comments.
 var b string
+
+type c struct {
+	//+optional
+	d *int `json:"d,omitempty"`
+}