Minor fixes (#25059)

1) Examples: Remove double space between "option:" and "value"
2) Documentation: Fix rendering usses
3) Documentation: Remove `required: true` to match argspec

lib/ansible/modules/network/cloudengine/ce_stp.py

@@ -140,26 +140,26 @@ EXAMPLES = '''
 
   - name: "Config stp mode"
     ce_stp:
-      state:  present
-      stp_mode:  stp
+      state: present
+      stp_mode: stp
       provider: "{{ cli }}"
 
   - name: "Undo stp mode"
     ce_stp:
-      state:  absent
-      stp_mode:  stp
+      state: absent
+      stp_mode: stp
       provider: "{{ cli }}"
 
   - name: "Enable bpdu protection"
     ce_stp:
-      state:  present
-      bpdu_protection:  enable
+      state: present
+      bpdu_protection: enable
       provider: "{{ cli }}"
 
   - name: "Disable bpdu protection"
     ce_stp:
-      state:  present
-      bpdu_protection:  disable
+      state: present
+      bpdu_protection: disable
       provider: "{{ cli }}"
 '''