Updated some examples following the naming convention

According to Solidity naming convention:
https://docs.soliditylang.org/en/latest/style-guide.html#naming-conventions There is no need to use
underscore except when there is a naming collision. In which case, a trailing underscore is used to
avoid the collision. So in this change, I am removing all underscores, except for the ones that
could shadow other symbols in their context (none of the changed names is a reserved keyword:
https://docs.soliditylang.org/en/latest/cheatsheet.html?highlight=reserved#reserved-keywords )

docs/examples/safe-remote.rst

@@ -36,8 +36,8 @@ you can use state machine-like constructs inside a contract.
         // The state variable has a default value of the first member, `State.created`
         State public state;
 
-        modifier condition(bool _condition) {
-            require(_condition);
+        modifier condition(bool condition_) {
+            require(condition_);
             _;
         }
 
@@ -62,8 +62,8 @@ you can use state machine-like constructs inside a contract.
             _;
         }
 
-        modifier inState(State _state) {
-            if (state != _state)
+        modifier inState(State state_) {
+            if (state != state_)
                 revert InvalidState();
             _;
         }