fix typos in various modules and docsite (#28747)

docs/docsite/rst/common_return_values.rst

@@ -3,10 +3,10 @@ Return Values
 
 .. contents:: Topics
 
-Ansible modules normally return a data structure that can be registered into a variable, or seen directly when output by 
+Ansible modules normally return a data structure that can be registered into a variable, or seen directly when output by
 the `ansible` program. Each module can optionally document its own unique return values (visible through ansible-doc and https://docs.ansible.com).
 
-This document covers return values common to all modules. 
+This document covers return values common to all modules.
 
 .. note:: Some of these keys might be set by Ansible itself once it processes the module's return information.
 
@@ -54,7 +54,7 @@ Some modules execute command line utilities or are geared for executing commands
 
 stderr_lines
 ````````````
-When c(stderr) is returned we also always provide this field which is a list of strings, one item per line from the original.
+When `stderr` is returned we also always provide this field which is a list of strings, one item per line from the original.
 
 stdout
 ``````
@@ -62,7 +62,7 @@ Some modules execute command line utilities or are geared for executing commands
 
 stdout_lines
 ````````````
-When c(stdout) is returned, Ansible always provides a list of strings, each containing one item per line from the original output.
+When `stdout` is returned, Ansible always provides a list of strings, each containing one item per line from the original output.
 
 
 .. _internal_return_values:

lib/ansible/modules/cloud/amazon/rds.py

@@ -126,7 +126,7 @@ options:
     description:
       - Port number that the DB instance uses for connections. Used only when command=create or command=replicate.
       - Prior to 2.0 it always defaults to null and the API would use 3306, it had to be set to other DB default values when not using MySql.
-        Starting at 2.0 it automatically defaults to what is expected for each c(db_engine).
+        Starting at 2.0 it automatically defaults to what is expected for each C(db_engine).
     required: false
     default: 3306 for mysql, 1521 for Oracle, 1433 for SQL Server, 5432 for PostgreSQL.
   upgrade:

lib/ansible/modules/network/junos/junos_rpc.py

@@ -22,7 +22,7 @@ short_description: Runs an arbitrary RPC over NetConf on an Juniper JUNOS device
 description:
   - Sends a request to the remote device running JUNOS to execute the
     specified RPC using the NetConf transport.  The reply is then
-    returned to the playbook in the c(xml) key.  If an alternate output
+    returned to the playbook in the C(xml) key.  If an alternate output
     format is requested, the reply is transformed to the requested output.
 extends_documentation_fragment: junos
 options:

lib/ansible/modules/packaging/os/slackpkg.py

@@ -35,7 +35,7 @@ options:
 
     state:
         description:
-            - state of the package, you can use "installed" as an alias for C(present) and removed as one for c(absent).
+            - state of the package, you can use "installed" as an alias for C(present) and removed as one for C(absent).
         choices: [ 'present', 'absent', 'latest' ]
         required: false
         default: present

lib/ansible/utils/module_docs_fragments/exoscale.py

@@ -11,20 +11,20 @@ options:
   api_key:
     description:
       - API key of the Exoscale DNS API.
-      - Since 2.4, the ENV variable c(CLOUDSTACK_KEY) is used as default, when defined.
+      - Since 2.4, the ENV variable C(CLOUDSTACK_KEY) is used as default, when defined.
   api_secret:
     description:
       - Secret key of the Exoscale DNS API.
-      - Since 2.4, the ENV variable c(CLOUDSTACK_SECRET) is used as default, when defined.
+      - Since 2.4, the ENV variable C(CLOUDSTACK_SECRET) is used as default, when defined.
   api_timeout:
     description:
       - HTTP timeout to Exoscale DNS API.
-      - Since 2.4, the ENV variable c(CLOUDSTACK_TIMEOUT) is used as default, when defined.
+      - Since 2.4, the ENV variable C(CLOUDSTACK_TIMEOUT) is used as default, when defined.
     default: 10
   api_region:
     description:
       - Name of the ini section in the C(cloustack.ini) file.
-      - Since 2.4, the ENV variable c(CLOUDSTACK_REGION) is used as default, when defined.
+      - Since 2.4, the ENV variable C(CLOUDSTACK_REGION) is used as default, when defined.
     default: cloudstack
   validate_certs:
     description: