docs: fix promtail docs links in loki installation page (#4601)

* docs: fix promtail docs links in loki installation page

fixes link to "syslog-reciever" and "systemd-journal" config docs

Signed-off-by: Mustafa Can Sevinç <mcansevinc@gmail.com>

* docs: fix relative links in helm docs

Signed-off-by: Mustafa Can Sevinç <mcansevinc@gmail.com>

docs/sources/installation/helm.md

@@ -129,7 +129,7 @@ spec:
 
 In order to receive and process syslog messages in Promtail, the following changes will be necessary:
 
-* Review the [Promtail syslog-receiver configuration documentation](/docs/clients/promtail/scraping.md#syslog-receiver)
+* Review the [Promtail syslog-receiver configuration documentation](../../clients/promtail/scraping/#syslog-receiver)
 
 * Configure the Promtail Helm chart with the syslog configuration added to the `extraScrapeConfigs` section and associated service definition to listen for syslog messages. For example:
 
@@ -153,7 +153,7 @@ syslogService:
 
 In order to receive and process syslog message into Promtail, the following changes will be necessary:
 
-* Review the [Promtail systemd-journal configuration documentation](/docs/clients/promtail/scraping.md#journal-scraping-linux-only)
+* Review the [Promtail systemd-journal configuration documentation](../../clients/promtail/scraping/#journal-scraping-linux-only)
 
 * Configure the Promtail Helm chart with the systemd-journal configuration added to the `extraScrapeConfigs` section and volume mounts for the Promtail pods to access the log files. For example: