Fix the issues reported by phpcs

Working on this.

Added patch for the changes.
Please review.

+/**
+ * @file
+ * The crazyegg module file.
+ */
+

That is not the comment used for a module.

-  // if module is enabled, there is an account ID, user role is allowed and current page matches page targeting setting
+  /*
+   * If module is enabled,
+   * there is an account ID, user role is allowed and
+   * current page matches page targeting setting.
+   */

Comments used inside functions/methods use the other delimiter.

 /**
- * Build account path from account number/id, e.g:
- *  "1234567" => "0123/4567"
+ * Build account path from account number/id.
+ *
+ * E.g:"1234567" => "0123/4567".
+ *

The existing sentence was already correct. A period is not used before e.g.. It is also better to use for example, instead of e.g..

+ * If actual page URL matches patterns listed in
+ * `crazyegg_paths` variable, If the variable is empty,
+ * return true.
+ *
  * @return bool
+ *   Returns a boolean value.

The part about the return value should go after @return. Returns a boolean value. is not much helpful, apart non spelling correctly Boolean.

Updated patch and interdiff.

 /**
- * Build account path from account number/id, e.g:
- *  "1234567" => "0123/4567"
+ * Build account path from account number/id.
+ *
+ * E.g:"1234567" => "0123/4567".
+ *

In this section first line exceeds the number of character and gives error in phpcs, if we break this into two lines, phpcs does not allow it, and suggests to move the second line as a separate paragraph. Did the changes as suggested.
Please review.

+/**
+ * @file
+ * Primary module hooks for Crazy egg integration module.
+ */
+

Drupal does not have primary nor secondary hooks. The correct comment is Hook implementations for the Crazy Egg Integration module.

 /**
- * Implements hook_help().
- * Shows help info on `/admin/help/crazyegg` page
+ * Implements hook_help() for crazyegg module.
  */

The existing first line is already correct. It is the second line that should not be there.

-  // if module is enabled, there is an account ID, user role is allowed and current page matches page targeting setting
+  // If module is enabled,
+  // there is an account ID, user role is allowed and
+  // current page matches page targeting setting.

Coding standards say to keep lines shorter than 80 characters, not to split a comment at the first comma. // If module is enabled, is a way too short.

 /**
- * Build account path from account number/id, e.g:
- *  "1234567" => "0123/4567"
+ * Build account path from account number/id.
+ *
+ * For example, "1234567" => "0123/4567".
+ *
  * @return bool|string
+ *   Returns account path or FALSE.
  */

It is sufficient to use Build account path from account number/ID. as short description. The example is not necessary.

+ *
  * @return bool
+ *   Returns true if the variable is empty.

Return value description must not start with Returns.

+ *
  * @return bool
+ *   Returns a boolean value.

The return type is already reported from the @return line. The description must say when TRUE is returned from the function.

Working on this.

Patch updated.
Please review.

Please ignore the last patch.
Here is the updated patch.

-  // if module is enabled, there is an account ID, user role is allowed and current page matches page targeting setting
+  // If module is enabled, there is an account ID,
+  // user role is allowed and current page
+  // matches page targeting setting.

That line has been truncated too early. It does not contain 240 characters; then, why was it split in three lines?

<code>  * @return bool|string
+ *   Returns account path or FALSE.

The description must not start with Returns.
It also needs to explain when FALSE is returned.
Also, if TRUE is not returned, the correct return value type is false|string.

+ * Checks URL for matching pattern.
+ *
+ * Checks if actual page URL matches patterns listed in
+ * `crazyegg_paths` variable.

Both the short description and the long descriptions are missing articles.
` characters are not used in PHP comments.