docs(material/table): Example suggesting to use max-width to set column width is misleading (#29373)

The fix is to use the width property instead of max-width since this can be misleading as though the width will never exceed the max-width provided.

Author: lindoRR-07

src/components-examples/material/table/table-http/table-http-example.css

@@ -35,9 +35,9 @@ table {
 /* Column Widths */
 .mat-column-number,
 .mat-column-state {
-  max-width: 64px;
+  width: 64px;
 }
 
 .mat-column-created {
-  max-width: 124px;
+  width: 124px;
 }