CLI: Fixed cmds help strings (#3566)

This fixes a few command help string outputs that were
cut short because of a typo.

dvc/command/data_sync.py

@@ -195,8 +195,10 @@ def add_parser(subparsers, _parent_parser):
     push_parser.set_defaults(func=CmdDataPush)
 
     # Fetch
-    FETCH_HELP = "Get tracked files or directories from remote storage"
-    " into the cache."
+    FETCH_HELP = (
+        "Get tracked files or directories from remote storage"
+        " into the cache."
+    )
 
     fetch_parser = subparsers.add_parser(
         "fetch",

dvc/command/diff.py

@@ -121,7 +121,7 @@ def run(self):
 def add_parser(subparsers, parent_parser):
     DIFF_DESCRIPTION = (
         "Show changes between commits in the DVC repository,"
-        " or between a commit and the workspace."
+        " or between a commit and the workspace. "
         "Prints the list of paths added, modified, or deleted."
     )
     diff_parser = subparsers.add_parser(

dvc/command/repro.py

@@ -57,8 +57,9 @@ def run(self):
 
 
 def add_parser(subparsers, parent_parser):
-    REPRO_HELP = "Reproduce complete or partial pipelines"
-    " by executing their stages."
+    REPRO_HELP = (
+        "Reproduce complete or partial pipelines by executing their stages."
+    )
     repro_parser = subparsers.add_parser(
         "repro",
         parents=[parent_parser],

dvc/command/version.py

@@ -142,9 +142,9 @@ def _get_dvc_repo_info(repo):
 
 
 def add_parser(subparsers, parent_parser):
-    VERSION_HELP = "Display the DVC version"
-    " and system/environment information."
-
+    VERSION_HELP = (
+        "Display the DVC version and system/environment information."
+    )
     version_parser = subparsers.add_parser(
         "version",
         parents=[parent_parser],