fix(review): address Copilot review feedback on PR #357

- Replace placeholder references "Issue #XXX, PR #358" with correct
  "Issue #80, PR #357" in XMLContextFactory.kt (both saveContext KDocs)
  and XMLContextFactoryOutputStreamTest.kt (@DisplayName annotation)
- Delete docs/issues/issue-80.md stub (redirect to issue_80.md);
  README.md already links to the canonical issue_80.md file

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: bedaHovorka

core/src/jvmMain/kotlin/cz/vutbr/fit/interlockSim/xml/XMLContextFactory.kt

@@ -251,7 +251,7 @@ class XMLContextFactory : EditingContextFactory {
 	/**
 	 * Saves an editing context to an output stream.
 	 *
-	 * Pre-save validation (Issue #XXX, PR #358):
+	 * Pre-save validation (Issue #80, PR #357):
 	 * - Validates InOut count before serialization
 	 * - Prevents saving invalid contexts (< MIN_INOUT_ELEMENTS InOuts)
 	 * - Returns false if validation fails
@@ -292,7 +292,7 @@ class XMLContextFactory : EditingContextFactory {
 	/**
 	 * Saves an editing context to a file.
 	 *
-	 * Pre-save validation (Issue #XXX, PR #358):
+	 * Pre-save validation (Issue #80, PR #357):
 	 * - Validates InOut count before serialization
 	 * - Prevents saving invalid contexts (< MIN_INOUT_ELEMENTS InOuts)
 	 * - Returns false if validation fails

desktop-ui/src/test/kotlin/cz/vutbr/fit/interlockSim/xml/XMLContextFactoryOutputStreamTest.kt

@@ -538,7 +538,7 @@ class XMLContextFactoryOutputStreamTest : KoinTestBase() {
 	}
 
 	@Nested
-	@DisplayName("Pre-Save Validation (Issue #XXX, PR #358)")
+	@DisplayName("Pre-Save Validation (Issue #80, PR #357)")
 	inner class PreSaveValidationTests {
 		@Test
 		@DisplayName("saveContext to File rejects context with 0 InOuts")