use correct global remapping syntax in documentation

docs/metadata.rst

@@ -65,7 +65,7 @@ explanatory purposes.
       settings:
       {
         // Required for Solidity: Sorted list of remappings
-        remappings: [ ":g/dir" ],
+        remappings: [ ":g=/dir" ],
         // Optional: Optimizer settings. The fields "enabled" and "runs" are deprecated
         // and are only given for backwards-compatibility.
         optimizer: {

docs/using-the-compiler.rst

@@ -187,7 +187,7 @@ Input Description
       "settings":
       {
         // Optional: Sorted list of remappings
-        "remappings": [ ":g/dir" ],
+        "remappings": [ ":g=/dir" ],
         // Optional: Optimizer settings
         "optimizer": {
           // disabled by default