Assorted synth fixups / cleanups (#6400)

* Asset: Replace 'stable' -> 'latest' in docs links, caused by out-of-date synth.
* AutoML: fix copying generated docs.
* Bigtable: remove now-spurious fixup from 'synth.py'.
* DLP: remove now-spurious fixups from 'synth.py'.
* Monitoring: remove now-spurious fixups from 'synth.py'.
* Redis: remove now-spurious fixups from 'synth.py'.
* Speech: remove now-spurious fixups from 'synth.py'.

packages/google-cloud-dlp/synth.py

@@ -41,11 +41,6 @@
     "google\.cloud\.privacy\.dlp_v2",
     "google.cloud.dlp_v2"
 )
-s.replace(
-    "tests/**/*.py",
-    "google\.cloud\.privacy\.dlp_v2",
-    "google.cloud.dlp_v2"
-)
 
 # Add missing utf-8 marker
 s.replace(
@@ -82,15 +77,6 @@
     "\g<1> \\\n\g<2> \\\n"
 )
 
-s.replace(
-    "google/cloud/dlp_v2/proto/storage_pb2.py",
-    "(proximity:)\n(\s+Proximity.*)\n(\s+reside..*)\n(\s+characters..*)\n"
-    "(\s+the window.*)\n(\s+of the finding.*)\n(\s+number regex.*)\n"
-    "(\s+latex:.*)\n(\s+known to be the local.*)\n(\s+hotword regex.*)\n",
-    "\g<1> \\\n\g<2> \\\n\g<3> \\\n\g<4> \\\n\g<5> \\\n\g<6> \\\n\g<7> "
-    "\\\n\g<8> \\\n\g<9> \\\n\g<10> \\\n"
-)
-
 s.replace(
     "google/cloud/dlp_v2/proto/storage_pb2.py",
     "(likelihood_adjustment:)\n",