Fix string analyzers

Author: nojaf

src/FSharp.Formatting.ApiDocs/GenerateModel.fs

@@ -870,7 +870,7 @@ type internal CrossReferenceResolver(root, collectionName, qualify, extensions)
 
     let tryGetTypeFromMemberName (memberName: string) =
         let sub = removeParen memberName
-        let lastPeriod = sub.LastIndexOf(".")
+        let lastPeriod = sub.LastIndexOf('.')
 
         if lastPeriod > 0 then
             Some(memberName.Substring(0, lastPeriod))
@@ -879,7 +879,7 @@ type internal CrossReferenceResolver(root, collectionName, qualify, extensions)
 
     let tryGetShortMemberNameFromMemberName (memberName: string) =
         let sub = removeParen memberName
-        let lastPeriod = sub.LastIndexOf(".")
+        let lastPeriod = sub.LastIndexOf('.')
 
         if lastPeriod > 0 then
             Some(memberName.Substring(lastPeriod + 1))

src/FSharp.Formatting.Literate/ParseScript.fs

@@ -62,7 +62,7 @@ module internal CodeBlockUtils =
     let rec private collectComment (comment: string) lines =
         seq {
             let findCommentEnd (comment: string) =
-                let cend = comment.LastIndexOf("*)")
+                let cend = comment.LastIndexOf("*)", StringComparison.OrdinalIgnoreCase)
 
                 if cend = -1 then
                     failwith "A (* comment was not closed"