doc(macrorugo): add links to block concentration help page for concentration parameter

- repairing an oversight on Cd0 link for macro rugo compound

Refs #477

src/app/calculators/macrorugo/config.json

@@ -19,7 +19,10 @@
             },
             "Q",
             "Y",
-            "C"
+            {
+                "id": "C",
+                "help": "pam/concentration.html"
+            }
         ]
     },
     {

src/app/calculators/macrorugocompound/config.json

@@ -16,7 +16,10 @@
                 "help": "hsl/pente.html"
             },
             "Ks",
-            "C"
+            {
+                "id": "C",
+                "help": "pam/concentration.html"
+            }
         ]
     },
     {
@@ -25,7 +28,10 @@
         "fields": [
             "PBD",
             "PBH",
-            "Cd0"
+            {
+                "id": "Cd0",
+                "help": "pam/macrorugo_theorie.html#coefficient-de-trainee-dun-bloc-cd0"
+            }
         ]
     },
     {