chore: regenerate README (#582)

This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

```
2020-12-17 18:27:00,044 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigtable/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2020-12-17 18:27:00,999 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/a685e710-846a-4969-a779-fee6f22b33bf/targets

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

.github/readme/synth.metadata/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigtable.git",
-        "sha": "fa8f5ef216fcbcd9f57343475f03a7353b0e9ddd"
+        "sha": "93353cfa3cb4bc30146f592bb1d6cdaac1fefebc"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "d73e8dea90af1b463a7f9d4a33244cf4612ada7c"
+        "sha": "41e998d5afdc2c2143a23c9b044b9931936f7318"
       }
     }
   ]

README.md

@@ -303,15 +303,13 @@ metrics will be tagged with:
   Under normal circumstances, this will be 1.
 
 ### GFE metric views:
-
 * `cloud.google.com/java/bigtable/gfe_latency`: A distribution of the latency
-  between Google's network receives an RPC and reads back the first byte of
-  the response.
+between Google's network receives an RPC and reads back the first byte of
+the response.
 
 * `cloud.google.com/java/bigtable/gfe_header_missing_count`: A counter of the
-  number of RPC responses received without the server-timing header, which
-  indicates that the request probably never reached Google's network.
-
+number of RPC responses received without the server-timing header, which
+indicates that the request probably never reached Google's network.
 
 By default, the functionality is disabled. For example to enable metrics using
 [Google Stackdriver](https://cloud.google.com/monitoring/docs/):