docs: spelling correction for "targetting" (#418)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/c503f640-90ae-4547-bcc8-a154d32c609e/targets

- [ ] To automatically regenerate this PR, check this box.

Source-Link: googleapis/synthtool@15013ef

packages/google-cloud-bigquery-datatransfer/README.md

@@ -118,7 +118,7 @@ Our client libraries follow the [Node.js release schedule](https://nodejs.org/en
 Libraries are compatible with all current _active_ and _maintenance_ versions of
 Node.js.
 
-Client libraries targetting some end-of-life versions of Node.js are available, and
+Client libraries targeting some end-of-life versions of Node.js are available, and
 can be installed via npm [dist-tags](https://docs.npmjs.com/cli/dist-tag).
 The dist-tags follow the naming convention `legacy-(version)`.
 

packages/google-cloud-bigquery-datatransfer/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-bigquery-data-transfer.git",
-        "sha": "36eaf81b8e41cca45e606f6dd4e6a6c3cb3b4511"
+        "sha": "64513210200cf55b38b796703fe9464c89cda0ae"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "1f1148d3c7a7a52f0c98077f976bd9b3c948ee2b"
+        "sha": "15013eff642a7e7e855aed5a29e6e83c39beba2a"
       }
     }
   ],