fix typos in action.yml (#543)

Closes #542

Rebases #542 with the generated docs, and opening as myself so that
integration tests pass.

---------

Signed-off-by: Ahmad Nassri <email@ahmadnassri.com>
Co-authored-by: Ahmad Nassri <email@ahmadnassri.com>

Author: sethvargo

README.md

@@ -100,13 +100,13 @@ jobs:
     merged). To remove all values, set the value to the literal string `{}`.
 
     If both `env_vars` and `env_vars_file` are specified, the keys in
-    `env_vars` will take precendence over the keys in `env_vars_files`.
+    `env_vars` will take precendence over the keys in `env_vars_file`.
 
 -   <a name="env_vars_file"></a><a href="#user-content-env_vars_file"><code>env_vars_file</code></a>: _(Optional)_ Path to a file on disk, relative to the workspace, that defines
     environment variables. The file can be newline-separated KEY=VALUE pairs,
     JSON, or YAML format. If both `env_vars` and `env_vars_file` are
     specified, the keys in env_vars will take precendence over the keys in
-    env_vars_files.
+    env_vars_file.
 
         NAME=person
         EMAILS=foo@bar.com\,zip@zap.com
@@ -115,7 +115,7 @@ jobs:
     described in `env_vars`. You do not have to escape YAML or JSON.
 
     If both `env_vars` and `env_vars_file` are specified, the keys in
-    `env_vars` will take precendence over the keys in `env_vars_files`.
+    `env_vars` will take precendence over the keys in `env_vars_file`.
 
     **⚠️ DEPRECATION NOTICE:** This input is deprecated and will be removed in
     the next major version release.

action.yml

@@ -83,7 +83,7 @@ inputs:
       merged). To remove all values, set the value to the literal string `{}`.
 
       If both `env_vars` and `env_vars_file` are specified, the keys in
-      `env_vars` will take precendence over the keys in `env_vars_files`.
+      `env_vars` will take precendence over the keys in `env_vars_file`.
     required: false
 
   env_vars_file:
@@ -92,7 +92,7 @@ inputs:
       environment variables. The file can be newline-separated KEY=VALUE pairs,
       JSON, or YAML format. If both `env_vars` and `env_vars_file` are
       specified, the keys in env_vars will take precendence over the keys in
-      env_vars_files.
+      env_vars_file.
 
           NAME=person
           EMAILS=foo@bar.com\,zip@zap.com
@@ -101,7 +101,7 @@ inputs:
       described in `env_vars`. You do not have to escape YAML or JSON.
 
       If both `env_vars` and `env_vars_file` are specified, the keys in
-      `env_vars` will take precendence over the keys in `env_vars_files`.
+      `env_vars` will take precendence over the keys in `env_vars_file`.
 
       **⚠️ DEPRECATION NOTICE:** This input is deprecated and will be removed in
       the next major version release.