updated client doc to match code

docs/README_client.md

@@ -163,10 +163,10 @@ usersetcaps         Sets a user's capabilities.
 vmlist              Lists VMs.
                     Requires VM_LIST VM access capability or VM_LIST_ANY user capability.
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-vmcred2pdf          Creates a PDF with the credentials required to attach to running VMs.
+vmcreds2pdf         Creates a PDF with the credentials required to attach to running VMs.
                     Requires VM_LIST VM access capability or VM_LIST_ANY user capability.
 ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
-vmcred2csv          Creates a CSV file with the credentials required to attach to running VMs.
+vmcreds2csv         Creates a CSV file with the credentials required to attach to running VMs.
                     The written CSV file contains 4 columns: VM ID;VM name;port;password
                     Requires VM_LIST VM access capability or VM_LIST_ANY user capability.
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@@ -414,7 +414,7 @@ vmdelaccess lab2 student@nexus.org
 
 Generate `exam_vms.pdf` with the credentials required to connect to all running VMs matching "exam prog sys":
 ```
-vmcred2pdf "exam prog sys" output.pdf
+vmcreds2pdf "exam prog sys" output.pdf
 ```
 
 Extract and download the `/home` directory of all VMs matching "exam prog sys" (each directory is saved in a `.tar.gz` archive named after the VM's ID):
@@ -623,7 +623,7 @@ First, you need to create the VM that will be used by the students during the ex
 
 1. Finally, to produce the PDF file, `creds.pdf`, with all credentials required to attach to each VM, run:
    ```
-   vmcred2pdf "live exam progsys" creds.pdf
+   vmcreds2pdf "live exam progsys" creds.pdf
    ```
    This command displays that file was written successfully:
    ```