Fix the spelling of manditory (#50746)

packages/flutter/lib/src/foundation/diagnostics.dart

@@ -215,7 +215,7 @@ class TextTreeConfiguration {
     this.isBlankLineBetweenPropertiesAndChildren = true,
     this.beforeName = '',
     this.suffixLineOne = '',
-    this.manditoryFooter = '',
+    this.mandatoryFooter = '',
   }) : assert(prefixLineOne != null),
        assert(prefixOtherLines != null),
        assert(prefixLastChildLineOne != null),
@@ -363,7 +363,7 @@ class TextTreeConfiguration {
   final String footer;
 
   /// Footer to add even for root nodes.
-  final String manditoryFooter;
+  final String mandatoryFooter;
 
   /// Add a blank line between properties and children if both are present.
   final bool isBlankLineBetweenPropertiesAndChildren;
@@ -600,7 +600,7 @@ final TextTreeConfiguration errorTextConfiguration = TextTreeConfiguration(
   prefixOtherLinesRootNode: '',
   beforeName:               '══╡ ',
   suffixLineOne:            ' ╞══',
-  manditoryFooter:          '═════',
+  mandatoryFooter:          '═════',
   // No need to add a blank line as the footer makes the boundary of this
   // subtree unambiguous.
   addBlankLineIfNoChildren: false,
@@ -1341,9 +1341,9 @@ class TextTreeRenderer {
           if (childConfig.footer.isNotEmpty) {
             builder.prefixOtherLines = prefixChildrenRaw;
             builder.write('${childConfig.childLinkSpace}${childConfig.footer}');
-            if (childConfig.manditoryFooter.isNotEmpty) {
+            if (childConfig.mandatoryFooter.isNotEmpty) {
               builder.writeStretched(
-                childConfig.manditoryFooter,
+                childConfig.mandatoryFooter,
                 math.max(builder.wrapWidth, _wrapWidthProperties + childPrefixOtherLines.length),
               );
             }
@@ -1362,9 +1362,9 @@ class TextTreeRenderer {
           if (childConfig.footer.isNotEmpty) {
             builder.prefixOtherLines = prefixChildrenRaw;
             builder.write('${childConfig.linkCharacter}${childConfig.footer}');
-            if (childConfig.manditoryFooter.isNotEmpty) {
+            if (childConfig.mandatoryFooter.isNotEmpty) {
               builder.writeStretched(
-                childConfig.manditoryFooter,
+                childConfig.mandatoryFooter,
                 math.max(builder.wrapWidth, _wrapWidthProperties + childPrefixOtherLines.length),
               );
             }
@@ -1373,8 +1373,8 @@ class TextTreeRenderer {
         }
       }
     }
-    if (parentConfiguration == null && config.manditoryFooter.isNotEmpty) {
-      builder.writeStretched(config.manditoryFooter, builder.wrapWidth);
+    if (parentConfiguration == null && config.mandatoryFooter.isNotEmpty) {
+      builder.writeStretched(config.mandatoryFooter, builder.wrapWidth);
       builder.write(config.lineBreak);
     }
     return builder.build();