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Update _index.md (#72068)

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* Update _index.md 

Edits to the "Set up image rendering" doc.

1. First section, "Set up Image Rendering," last paragraph:
"You can also render a PNG by clicking hovering..." -- I removed "clicking" from that sentence.

2. "Alerting and Render Limits" section, link for "concurrent_render_limit" takes you to the page but not the section. This seems to be the case for all section links on this "Configure Grafana" page. I'm not sure how to fix it but switched from a relative link to a full path to see if that would help.

3. "Install Grafana Image Renderer Plugin," the link goes to the plugin overview page instead of the installation page. I tried adding the full path to see if that would go to the installation tab.

4. "Configuration" section, the same as the second edit I made, the first link, "Grafana configuration file," goes to the page but not the section link. I switched the relative path to a full path to see if it would work.

5. "Security" section, the very last sentence has the same Grafana configuration page link that goes to the correct page but not the correct section, "Grafana configuration" for the renderer token section. Same as previous ones, I switched out the relative path for the full path.

6. "Start browser with additional arguments," the second link in the first paragraph that goes to Puppeteer list of Chromium flags went to a 404 page. I couldn't figure out where they had moved it so I found a different site with a list of default flags and used that link instead.

* corrects links

* updates links

* fixes anchor link

---------

Co-authored-by: Chris Moyer <chris.moyer@grafana.com>
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docs/sources/setup-grafana/image-rendering/_index.md
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@ -26,7 +26,7 @@ While an image is being rendered, the PNG image is temporarily written to the fi
A background job runs every 10 minutes and removes temporary images. You can configure how long an image should be stored before being removed by configuring the [temp_data_lifetime]({{< relref "../configure-grafana#temp_data_lifetime" >}}) setting.
You can also render a PNG by clicking hovering over the panel to display the actions menu in the top right corner, and then clicking **Share > Direct link rendered image** in the Link tab.
You can also render a PNG by hovering over the panel to display the actions menu in the top right corner, and then clicking **Share > Direct link rendered image** in the Link tab.
## Alerting and render limits
@ -38,7 +38,7 @@ Alert notifications can include images, but rendering many images at the same ti
Starting from Grafana v7.0.0, all PhantomJS support has been removed. Please use the Grafana Image Renderer plugin or remote rendering service.
{{% /admonition %}}
To install the plugin, refer to the [Grafana Image Renderer Installation instructions](/grafana/plugins/grafana-image-renderer#installation).
To install the plugin, refer to the [Grafana Image Renderer Installation instructions](/grafana/plugins/grafana-image-renderer/?tab=installation#installation).
## Configuration
@ -88,7 +88,7 @@ AUTH_TOKEN=-
}
```
See the [Grafana configuration]({{< relref "../configure-grafana#renderer_token" >}}) for how to configure the token in Grafana.
See [Grafana configuration]({{< relref "../configure-grafana#renderer_token" >}}) for how to configure the token in Grafana.
### Rendering mode
@ -311,7 +311,7 @@ CHROME_BIN="/usr/bin/chromium-browser"
#### Start browser with additional arguments
Additional arguments to pass to the headless browser instance. Defaults are `--no-sandbox,--disable-gpu`. The list of Chromium flags can be found [here](https://peter.sh/experiments/chromium-command-line-switches/) and the list of flags used as defaults by Puppeteer can be found [there](https://github.com/puppeteer/puppeteer/blob/main/src/node/Launcher.ts#L172). Multiple arguments is separated with comma-character.
Additional arguments to pass to the headless browser instance. Defaults are `--no-sandbox,--disable-gpu`. The list of Chromium flags can be found [here](https://peter.sh/experiments/chromium-command-line-switches/) and the list of flags used as defaults by Puppeteer can be found [there](https://cri.dev/posts/2020-04-04-Full-list-of-Chromium-Puppeteer-flags/). Multiple arguments is separated with comma-character.
```bash
RENDERING_ARGS=--no-sandbox,--disable-setuid-sandbox,--disable-dev-shm-usage,--disable-accelerated-2d-canvas,--disable-gpu,--window-size=1280x758