Rename feature-gate-ck.md to feature-gate-check.md

Author: reddevilmidzy

src/SUMMARY.md

@@ -124,7 +124,7 @@
     - [`#[test]` implementation](./test-implementation.md)
     - [Panic implementation](./panic-implementation.md)
     - [AST validation](./ast-validation.md)
-    - [Feature gate checking](./feature-gate-ck.md)
+    - [Feature gate checking](./feature-gate-check.md)
     - [Lang Items](./lang-items.md)
 - [The HIR (High-level IR)](./hir.md)
     - [Lowering AST to HIR](./hir/lowering.md)

src/feature-gate-ck.md src/feature-gate-check.mdsrc/feature-gate-ck.md renamed to src/feature-gate-check.md

@@ -13,7 +13,7 @@ And parsing requires macro expansion, which in turn may require parsing the outp
 
 [AST]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_parse/index.html
 [macro expansion]: ./macro-expansion.md
-[feature-gate checking]: ./feature-gate-ck.md
+[feature-gate checking]: ./feature-gate-check.md
 [lexing, parsing]: ./the-parser.md
 [name resolution]: ./name-resolution.md
 [validation]: ./ast-validation.md