Fixed typos (#38247)

* fix: typo occured -> occurred

* fix: typo occured -> occurred

* fix: typo depenedency -> dependency

Author: hiro0218

include/swift/DependencyScan/DependencyScanningTool.h

@@ -31,7 +31,7 @@ class DependencyScanningTool {
   /// Construct a dependency scanning tool.
   DependencyScanningTool();
 
-  /// Collect the full module depenedency graph for the input, ignoring any
+  /// Collect the full module dependency graph for the input, ignoring any
   /// placeholder modules.
   ///
   /// \returns a \c StringError with the diagnostic output if errors
@@ -47,11 +47,11 @@ class DependencyScanningTool {
   llvm::ErrorOr<swiftscan_import_set_t>
   getImports(ArrayRef<const char *> Command);
 
-  /// Collect the full module depenedency graph for the input collection of
+  /// Collect the full module dependency graph for the input collection of
   /// module names (batch inputs) and output them to the
   /// BatchScanInput-specified output locations.
   ///
-  /// \returns a \c std::error_code if errors occured during scan.
+  /// \returns a \c std::error_code if errors occurred during scan.
   std::vector<llvm::ErrorOr<swiftscan_dependency_graph_t>>
   getDependencies(ArrayRef<const char *> Command,
                   const std::vector<BatchScanInput> &BatchInput,

include/swift/Syntax/SyntaxData.h

@@ -296,7 +296,7 @@ class SyntaxData final : public SyntaxDataRef {
 
   ~SyntaxData() {
     assert(RefCount == 0 &&
-           "Destruction occured when there are still references to this.");
+           "Destruction occurred when there are still references to this.");
     if (auto Parent = getParent()) {
       Parent->Release();
     }