Fix isfinite/isinf/isnan code snippets
diff --git a/doc/snippets/Cwise_boolean_not.cpp b/doc/snippets/Cwise_boolean_not.cpp
index 8b8e6fc..40009f1 100644
--- a/doc/snippets/Cwise_boolean_not.cpp
+++ b/doc/snippets/Cwise_boolean_not.cpp
@@ -2,4 +2,4 @@
 v(1) *= 0.0/0.0;
 v(2) /= 0.0;
 cout << v << endl << endl;
-cout << !isFinite(v) << endl;
+cout << !isfinite(v) << endl;
diff --git a/doc/snippets/Cwise_isFinite.cpp b/doc/snippets/Cwise_isFinite.cpp
index 7e59456..1da55fd 100644
--- a/doc/snippets/Cwise_isFinite.cpp
+++ b/doc/snippets/Cwise_isFinite.cpp
@@ -2,4 +2,4 @@
 v(1) *= 0.0/0.0;
 v(2) /= 0.0;
 cout << v << endl << endl;
-cout << isFinite(v) << endl;
+cout << isfinite(v) << endl;
diff --git a/doc/snippets/Cwise_isInf.cpp b/doc/snippets/Cwise_isInf.cpp
index beb6746..be79308 100644
--- a/doc/snippets/Cwise_isInf.cpp
+++ b/doc/snippets/Cwise_isInf.cpp
@@ -2,4 +2,4 @@
 v(1) *= 0.0/0.0;
 v(2) /= 0.0;
 cout << v << endl << endl;
-cout << isInf(v) << endl;
+cout << isinf(v) << endl;
diff --git a/doc/snippets/Cwise_isNaN.cpp b/doc/snippets/Cwise_isNaN.cpp
index cc1e7fe..7b2a930 100644
--- a/doc/snippets/Cwise_isNaN.cpp
+++ b/doc/snippets/Cwise_isNaN.cpp
@@ -2,4 +2,4 @@
 v(1) *= 0.0/0.0;
 v(2) /= 0.0;
 cout << v << endl << endl;
-cout << isNaN(v) << endl;
+cout << isnan(v) << endl;