Fix broken links.

02-Logging/01-Logging-to-a-file.ipynb

@@ -321,7 +321,7 @@
    "source": [
     "## Writing log quantities to a file\n",
     "\n",
-    "Use the **HDF5Log** writer to store the quantities provided by `logger` to a [HDF5](https://www.hdfgroup.org/solutions/hdf5/) (`.h5`) file."
+    "Use the **HDF5Log** writer to store the quantities provided by `logger` to a HDF5 (`.h5`) file."
    ]
   },
   {
@@ -385,7 +385,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "HDF5 is a **binary** file format. You must use tools that support the format to access the file. The HDF5 library provides [command line tools](https://portal.hdfgroup.org/display/HDF5/HDF5+Command-line+Tools) to examine the file contents interactively. `h5ls` lists the datasets in the file:\n",
+    "HDF5 is a **binary** file format. You must use tools that support the format to access the file. The HDF5 library provides command line tools to examine the file contents interactively. `h5ls` lists the datasets in the file:\n",
     "\n",
     "<div class=\"alert alert-info\">\n",
     "In Jupyter, the “!” magic command is equivalent to typing the given command in a shell.\n",
@@ -481,7 +481,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Use the [`h5py` package](https://www.h5py.org/) to read HDF5 files in Python:"
+    "Use the `h5py` package to read HDF5 files in Python:"
    ]
   },
   {