Fix typo Occurance -> Occurence

Author: ahoppen

Sources/SwiftParserDiagnostics/LexerDiagnosticMessages.swift

@@ -191,8 +191,8 @@ public extension SwiftSyntax.LexerError {
       }
       let replacedText =
         text
-        .replacingFirstOccurance(of: "“", with: #"""#)
-        .replacingLastOccurance(of: "”", with: #"""#)
+        .replacingFirstOccurence(of: "“", with: #"""#)
+        .replacingLastOccurence(of: "”", with: #"""#)
 
       let fixedToken = token.withKind(TokenKind.fromRaw(kind: rawKind, text: replacedText))
       return [

Sources/SwiftParserDiagnostics/Utils.swift

@@ -19,14 +19,14 @@ extension String {
     }
   }
 
-  func replacingFirstOccurance(of character: Character, with replacement: Character) -> String {
+  func replacingFirstOccurence(of character: Character, with replacement: Character) -> String {
     guard let match = self.firstIndex(of: character) else {
       return self
     }
     return self[startIndex..<match] + String(replacement) + self[index(after: match)...]
   }
 
-  func replacingLastOccurance(of character: Character, with replacement: Character) -> String {
+  func replacingLastOccurence(of character: Character, with replacement: Character) -> String {
     guard let match = self.lastIndex(of: character) else {
       return self
     }