chore: fix error in docs-presubmit config (#99)

* changes without context

        autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

* chore: add missing quotation mark

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Mon Jan 11 09:43:06 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 16ec872dd898d7de6e1822badfac32484b5d9031
Source-Link: googleapis/synthtool@16ec872

.kokoro/docs/docs-presubmit.cfg

@@ -18,7 +18,7 @@ env_vars: {
 
 env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
-    value: github/python-datacatalog/.kokoro/build.sh"
+    value: "github/python-datacatalog/.kokoro/build.sh"
 }
 
 # Only run this nox session.

google/cloud/datacatalog_v1beta1/__init__.py

@@ -103,7 +103,6 @@
     "CreateTagTemplateFieldRequest",
     "CreateTagTemplateRequest",
     "CreateTaxonomyRequest",
-    "DataCatalogClient",
     "DeleteEntryGroupRequest",
     "DeleteEntryRequest",
     "DeletePolicyTagRequest",
@@ -140,6 +139,7 @@
     "ListTaxonomiesResponse",
     "LookupEntryRequest",
     "PolicyTag",
+    "PolicyTagManagerClient",
     "PolicyTagManagerSerializationClient",
     "RenameTagTemplateFieldRequest",
     "Schema",
@@ -165,5 +165,5 @@
     "UpdateTagTemplateRequest",
     "UpdateTaxonomyRequest",
     "ViewSpec",
-    "PolicyTagManagerClient",
+    "DataCatalogClient",
 )

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/python-datacatalog.git",
-        "sha": "3d96b69d68295ad2032556b45faf729c715e71e0"
+        "sha": "890b6cc7c323a61255e001a21081beafb88c83f5"
       }
     },
     {
@@ -19,14 +19,14 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "fb53b6fb373b7c3edf4e55f3e8036bc6d73fa483"
+        "sha": "16ec872dd898d7de6e1822badfac32484b5d9031"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "fb53b6fb373b7c3edf4e55f3e8036bc6d73fa483"
+        "sha": "16ec872dd898d7de6e1822badfac32484b5d9031"
       }
     }
   ],