Fix sentence in bdb.rst

Doc/library/bdb.rst

@@ -463,7 +463,7 @@ Finally, the module defines the following functions:
    If it was set via line number, it checks if
    :attr:`b.line <bdb.Breakpoint.line>` is the same as the one in *frame*.
    If the breakpoint was set via
-   :attr:`function name <bdb.Breakpoint.funcname>`, we have to check we are in
+   :attr:`function name <bdb.Breakpoint.funcname>`, we have to check if we are in
    the right *frame* (the right function) and if we are on its first executable
    line.