fix typos in option docu

- taken from 02ce615

Author: svigerske

src/Algorithm/IpDefaultIterateInitializer.cpp

@@ -87,7 +87,7 @@ void DefaultIterateInitializer::RegisterOptions(
       "mu-based", "initialize to mu_init/x_slack",
       "This option defines how the iterates for the bound multipliers are initialized. "
       "If \"constant\" is chosen, then all bound multipliers are initialized to the value of \"bound_mult_init_val\". "
-      "If \"mu-based\" is chosen, the each value is initialized to the the value of \"mu_init\" "
+      "If \"mu-based\" is chosen, then each value is initialized to the the value of \"mu_init\" "
       "divided by the corresponding slack variable. "
       "This latter option might be useful if the starting point is close to the optimal solution.");
    reg_options->AddStringOption2(

src/Algorithm/IpFilterLSAcceptor.cpp

@@ -55,7 +55,7 @@ void FilterLSAcceptor::RegisterOptions(SmartPtr<RegisteredOptions> roptions)
       1e-4,
       "The algorithmic parameter theta_min is determined as theta_min_fact "
       "times the maximum of 1 and the constraint violation at initial point. "
-      "The switching rules treats an iteration as an h-type iteration whenever "
+      "The switching rule treats an iteration as an h-type iteration whenever "
       "the current constraint violation is larger than theta_min (see "
       "paragraph before Eqn. (19) in the implementation paper).",
       true);