doc: review comments

1. use <code> tag
2. bottom bookmark for File Access Constants
3. typo fix

Closes: nodejs#20049

Author: shobhitchittora

doc/api/fs.md

@@ -746,10 +746,9 @@ changes:
 
 Tests a user's permissions for the file or directory specified by `path`.
 The `mode` argument is an optional integer that specifies the accessibility
-checks to be performed. Check
-[`File Access Contants`](#fs_file_access_constants) for possible values of
-`mode`. It is possible to create a mask consisting of the bitwise OR of two or
-more values (e.g. `fs.constants.W_OK | fs.constants.R_OK`).
+checks to be performed. Check [File Access Constants][] for possible values
+of `mode`. It is possible to create a mask consisting of the bitwise OR of
+two or more values (e.g. `fs.constants.W_OK | fs.constants.R_OK`).
 
 The final argument, `callback`, is a callback function that is invoked with
 a possible error argument. If any of the accessibility checks fail, the error
@@ -882,11 +881,12 @@ changes:
 * `path` {string|Buffer|URL}
 * `mode` {integer} **Default:** `fs.constants.F_OK`
 
-Synchronously tests a user's permissions for the file or directory specified by
-`path`. The `mode` argument is an optional integer that specifies the
-accessibility checks to be performed. Check [`File Access Contants`](#fs_file_access_constants) for
-possible values of `mode`. It is possible to create a mask consisting of the
-bitwise OR of two or more values (e.g. `fs.constants.W_OK | fs.constants.R_OK`).
+Synchronously tests a user's permissions for the file or directory specified
+by `path`. The `mode` argument is an optional integer that specifies the
+accessibility checks to be performed. Check [File Access Constants][] for
+possible values of `mode`. It is possible to create a mask consisting of
+the bitwise OR of two or more values
+(e.g. `fs.constants.W_OK | fs.constants.R_OK`).
 
 If any of the accessibility checks fail, an `Error` will be thrown. Otherwise,
 the method will return `undefined`.
@@ -4316,7 +4316,7 @@ The following constants are meant for use with [`fs.access()`][].
     <td><code>F_OK</code></td>
     <td>Flag indicating that the file is visible to the calling process.
      This is useful for determining if a file exists, but says nothing
-     about rwx permissions. Default if no mode is specified.</td>
+     about <code>rwx</code> permissions. Default if no mode is specified.</td>
   </tr>
   <tr>
     <td><code>R_OK</code></td>
@@ -4331,7 +4331,7 @@ The following constants are meant for use with [`fs.access()`][].
     <td><code>X_OK</code></td>
     <td>Flag indicating that the file can be executed by the calling
     process. This has no effect on Windows
-    (will behave like fs.constants.F_OK).</td>
+    (will behave like <code>fs.constants.F_OK</code>).</td>
   </tr>
 </table>
 
@@ -4694,3 +4694,4 @@ the file contents.
 [Naming Files, Paths, and Namespaces]: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx
 [MSDN-Using-Streams]: https://msdn.microsoft.com/en-us/library/windows/desktop/bb540537.aspx
 [support of file system `flags`]: #fs_file_system_flags
+[File Access Constants]: #fs_file_access_constants