chore(docs): fix bold formatting in command flags in reference.md (argoproj-labs#1114)

Signed-off-by: Cheng Fang <cfang@redhat.com>

Author: chengfang

docs/install/reference.md

@@ -26,7 +26,7 @@ Runs the Argo CD Image Updater, possibly in an endless loop.
 
 ### Flags
 
-**--argocd-auth-token *token* **
+**--argocd-auth-token *token***
 
 Use *token* for authenticating to the Argo CD API. This token must be a base64
 encoded JWT, as generated by Argo CD.
@@ -57,7 +57,7 @@ TLS.
 
 Can also be set using the *ARGOCD_PLAINTEXT* environment variable.
 
-**--argocd-server-addr *server address* **
+**--argocd-server-addr *server address***
 
 Connect to the Argo CD API server at *server address*. *server address* must
 be a valid IP address or DNS host name, optionally with a port specification
@@ -79,13 +79,13 @@ for images can only be specified from an environment variable.
 If this flag is set, Argo CD Image Updater won't actually perform any changes
 to workloads it found in need for upgrade.
 
-**--health-port *port* **
+**--health-port *port***
 
 Specifies the local port to bind the health server to. The health server is
 used to provide health and readiness probes when running as K8s workload.
 Use value *0* for *port* to disable launching the health server.
 
-**--interval *duration* **
+**--interval *duration***
 
 Sets the interval for checking whether there are new images available to
 *duration*. *duration* must be given as a valid duration identifier with
@@ -103,40 +103,40 @@ The order of precedence for determining the update interval is as follows:
 2.  **`IMAGE_UPDATER_INTERVAL` environment variable:** If the `--interval` flag is not set, the value of the `IMAGE_UPDATER_INTERVAL` environment variable will be used.
 3.  **Default value:** If neither the `--interval` flag nor the `IMAGE_UPDATER_INTERVAL` environment variable is set, the default value will be used.
 
-**--kubeconfig *path* **
+**--kubeconfig *path***
 
 Specify the Kubernetes client config file to use when running outside a
 Kubernetes cluster, i.e. `~/.kube/config`. When specified, Argo CD Image
 Updater will use the currently active context in the configuration to connect
 to the Kubernetes cluster.
 
-**--loglevel *level* **
+**--loglevel *level***
 
 Set the log level to *level*, where *level* can be one of `trace`, `debug`,
 `info`, `warn` or `error`.
 
 Can also be set using the *IMAGE_UPDATER_LOGLEVEL* environment variable.
 
-**--match-application-name *pattern* **
+**--match-application-name *pattern***
 
 Only process applications that have a valid annotation and matches the given
 *pattern*. The *pattern* is a simple glob pattern and supports file system
 style wildcards, i.e. `*-staging` would match any application name with a
 suffix of `-staging`. Can be specified multiple times to define more than
 one pattern, from which at least one has to match.
 
-**--match-application-label *selector* **
+**--match-application-label *selector***
 
 Only process applications that have a valid annotation and match the given
-*label* selector. The *selector* is a string that matches the standard kubernetes label
-[label selector syntax][]. For e.g, `custom.label/name=xyz` would be a valid label
+*label* selector. The *selector* is a string that matches the standard kubernetes
+[label selector syntax][]. For e.g., `custom.label/name=xyz` would be a valid label
 that can be supplied through this parameter. Any applications carrying this
 exact label will be considered as candidates for image updates. This parameter
 currently does not support pattern matching on label values (e.g `customer.label/name=*-staging`).
 You can specify equality, inequality, or set based requirements or a combination.
 For e.g., `app,app!=foo,custom.label/name=xyz,customer in (a,b,c)`
 
-**--max-concurrency *number* **
+**--max-concurrency *number***
 
 Process a maximum of *number* applications concurrently. To disable concurrent
 application processing, specify a number of `1`.
@@ -146,7 +146,7 @@ application processing, specify a number of `1`.
 A shortcut for specifying `--interval 0 --health-port 0`. If given,
 Argo CD Image Updater will exit after the first update cycle.
 
-**--registries-conf-path *path* **
+**--registries-conf-path *path***
 
 Load the registry configuration from file at *path*. Defaults to the path
 `/app/config/registries.conf`. If no configuration should be loaded, and the