tools: Add missing spaces in concatenated string literals.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

tools/lib/provision.py

@@ -64,7 +64,7 @@ try:
     os.remove(os.path.join(VAR_DIR_PATH, "zulip-test-symlink"))
 except OSError:
     print(
-        FAIL + "Error: Unable to create symlinks."
+        FAIL + "Error: Unable to create symlinks. "
         "Make sure you have permission to create symbolic links." + ENDC
     )
     print("See this page for more information:")

tools/linter_lib/custom_check.py

@@ -674,7 +674,7 @@ html_rules: List["Rule"] = [
     },
     {
         "pattern": r"\bon\w+ ?=",
-        "description": "Don't use inline event handlers (onclick=, etc. attributes) in HTML. Instead,"
+        "description": "Don't use inline event handlers (onclick=, etc. attributes) in HTML. Instead, "
         "attach a jQuery event handler ($('#foo').on('click', function () {...})) when "
         "the DOM is ready (inside a $(function () {...}) block).",
         "exclude": {

zerver/tests/test_new_users.py

@@ -225,7 +225,7 @@ class TestBrowserAndOsUserAgentStrings(ZulipTestCase):
                 "Windows",
             ),
             (
-                "Mozilla/5.0 (X11; CrOS x86_64 10895.56.0) AppleWebKit/537.36"
+                "Mozilla/5.0 (X11; CrOS x86_64 10895.56.0) AppleWebKit/537.36 "
                 "(KHTML, like Gecko) Chrome/69.0.3497.95 Safari/537.36",
                 "Chrome",
                 "ChromeOS",