STYLE: Remove "Download" from the fetcher method descriptions

Remove "Download" from the fetcher method descriptions for the sake of
consistency across descriptions, and in order to describe the dataset
itself rather than the method.

tractolearn/tractoio/dataset_fetch.py

@@ -340,7 +340,7 @@ def fetcher():
     ["best_model_contrastive_tractoinferno_hcp.pt"],
     ["best_model_contrastive_tractoinferno_hcp.pt"],
     ["2181aa950d8110b89f5b4bf7ebbb9aff"],
-    "Download contrastive-loss trained tractolearn autoencoder weights",
+    "Contrastive-loss trained tractolearn autoencoder weights",
     "56.7MB",
     "",
     False,
@@ -352,7 +352,7 @@ def fetcher():
     ["mni_masked.nii.gz"],
     ["mni_masked.nii.gz"],
     ["ea6c119442d23a25033de19b55c607d3"],
-    "Download MNI ICBM 2009c Nonlinear Symmetric 1×1x1mm template dataset",
+    "MNI ICBM 2009c Nonlinear Symmetric 1×1x1mm template dataset",
     "4.9MB",
     "",
     False,
@@ -424,7 +424,7 @@ def fetcher():
     ["atlas.zip"],
     ["atlas.zip"],
     ["0d2857efa7cfda6f57e5abcad4717c2a"],
-    "Download RecoBundlesX population average and centroid tractograms",
+    "RecoBundlesX population average and centroid tractograms",
     "159.0MB",
     "",
     True,
@@ -436,7 +436,7 @@ def fetcher():
     ["config.zip"],
     ["config.zip"],
     ["439e2488597243455872ec3dcb50eda7"],
-    "Download RecoBundlesX clustering parameter values",
+    "RecoBundlesX clustering parameter values",
     "3.6KB",
     "",
     True,
@@ -460,7 +460,7 @@ def fetcher():
     ["data_tractoinferno_hcp_qbx.hdf5"],
     ["data_tractoinferno_hcp_qbx.hdf5"],
     ["4803d36278d1575a40e9048a7380aa10"],
-    "Download TractoInferno-HCP reference tractography dataset",
+    "TractoInferno-HCP reference tractography dataset",
     "74.0GB",
     "",
     False,