Docs: Update troubleshooting.md (grafana#21244)

Fixed a few minor grammar errors.

Fixes grafana#19295

Author: oddlittlebird

docs/sources/installation/troubleshooting.md

@@ -11,31 +11,30 @@ weight = 8
 
 # Troubleshooting
 
-## Visualization and Query issues
+This page lists some useful tools to help troubleshoot common Grafana issues.
+
+## Visualization and query issues
 
 {{< imgbox max-width="40%" img="/img/docs/v45/query_inspector.png" caption="Query Inspector" >}}
 
-The most common problems are related to the query and response from you data source. Even if it looks
-like a bug or visualization issue in Grafana it is 99% of time a problem with the data source query or
+The most common problems are related to the query and response from your data source. Even if it looks
+like a bug or visualization issue in Grafana, it is almost always a problem with the data source query or
 the data source response.
 
-To check this you should use Query Inspector (new in Grafana v4.5). The query Inspector shows query requests and responses.
+To check this you should use query inspector, which was added in Grafana 4.5. The query inspector shows query requests and responses. Refer to the data source page for more information.
 
-For more on the query inspector read [this guide here](https://community.grafana.com/t/using-grafanas-query-inspector-to-troubleshoot-issues/2630). For
-older versions of Grafana read the [how troubleshoot metric query issue](https://community.grafana.com/t/how-to-troubleshoot-metric-query-issues/50/2) article.
+For more on the query inspector read the Grafana Community article [Using Grafana’s Query Inspector to troubleshoot issues](https://community.grafana.com/t/using-grafanas-query-inspector-to-troubleshoot-issues/2630). For older versions of Grafana, refer to the [How troubleshoot metric query issue](https://community.grafana.com/t/how-to-troubleshoot-metric-query-issues/50/2) article.
 
 ## Logging
 
-If you encounter an error or problem it is a good idea to check the grafana server log. Usually
-located at `/var/log/grafana/grafana.log` on Unix systems or in `<grafana_install_dir>/data/log` on
-other platforms and manual installs.
+If you encounter an error or problem, then you can check the Grafana server log. Usually located at `/var/log/grafana/grafana.log` on Unix systems or in `<grafana_install_dir>/data/log` on other platforms and manual installs.
 
-You can enable more logging by changing log level in your grafana configuration file.
+You can enable more logging by changing log level in the Grafana configuration file.
 
 ## Diagnostics
 
-The `grafana-server` process can be instructued to enable certain diagnostics when it starts. This can be helpful
-when experiencing/investigating certain performance problems. It's `not` recommended to have these enabled per default.
+The `grafana-server` process can be instructed to enable certain diagnostics when it starts. This can be helpful
+when investigating certain performance problems. It's *not* recommended to have these enabled per default.
 
 ### Profiling
 
@@ -46,27 +45,26 @@ the default HTTP port (`6060`) where the pprof debugging endpoints will be avail
 ./grafana-server -profile -profile-port=8080
 ```
 
-Note that pprof debugging endpoints are served on a different port than the Grafana HTTP server.
+Note that `pprof` debugging endpoints are served on a different port than the Grafana HTTP server.
 
-You can configure/override profiling settings using environment variables:
+You can configure or override profiling settings using environment variables:
 
 ```bash
 export GF_DIAGNOSTICS_PROFILING_ENABLED=true
 export GF_DIAGNOSTICS_PROFILING_PORT=8080
 ```
 
-See [Go command pprof](https://golang.org/cmd/pprof/) for more information about how to collect and analyze profiling data.
+Refer to [Go command pprof](https://golang.org/cmd/pprof/) for more information about how to collect and analyze profiling data.
 
 ### Tracing
 
-The `grafana-server` can be started with the arguments `-tracing` to enable tracing and `-tracing-file` to
-override the default trace file (`trace.out`) where trace result will be written to, e.g.
+The `grafana-server` can be started with the arguments `-tracing` to enable tracing and `-tracing-file` to override the default trace file (`trace.out`) where trace result is written to. For example:
 
 ```bash
 ./grafana-server -tracing -tracing-file=/tmp/trace.out
 ```
 
-You can configure/override profiling settings using environment variables:
+You can configure or override profiling settings using environment variables:
 
 ```bash
 export GF_DIAGNOSTICS_TRACING_ENABLED=true
@@ -84,8 +82,7 @@ go tool trace <trace file>
 
 See [Go command trace](https://golang.org/cmd/trace/) for more information about how to analyze trace files.
 
-## FAQ
+## FAQs
 
-Check out the [FAQ](https://community.grafana.com/c/howto/faq) section on our community page for frequently
+Check out the [FAQ section](https://community.grafana.com/c/howto/faq) on the Grafana Community page for answers to frequently
 asked questions.
-