Fix YAML error

Author: cdervis

features_cpp26.yaml

@@ -898,13 +898,13 @@ features:
     ftm:
       - name: __cpp_lib_bind_front
         value: 202306L
-        desc: `std::bind_front()` is available
+        desc: "`std::bind_front()` is available"
       - name: __cpp_lib_bind_back
         value: 202306L
-        desc: `std::bind_back()` is available
+        desc: "`std::bind_back()` is available"
       - name: __cpp_lib_not_fn
         value: 202306L
-        desc: `std::not_fn` is available
+        desc: "`std::not_fn` is available"
 
   - desc: "`std::submdspan()`"
     paper: