doc: fix typos on e.g. abbreviations

`eg.` was used in two places where `e.g.` was intended. Replace one
instance with `e.g.` and rewrite the other instance to not require the
abbreviation at all.

PR-URL: nodejs#21045
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>

doc/api/dns.md

@@ -508,7 +508,7 @@ will be present on the object:
 | `'PTR'` | `value` |
 | `'SOA'` | Refer to [`dns.resolveSoa()`][] |
 | `'SRV'` | Refer to [`dns.resolveSrv()`][] |
-| `'TXT'` | This type of record contains an array property called `entries` which refers to [`dns.resolveTxt()`][], eg. `{ entries: ['...'], type: 'TXT' }` |
+| `'TXT'` | This type of record contains an array property called `entries` which refers to [`dns.resolveTxt()`][], e.g. `{ entries: ['...'], type: 'TXT' }` |
 
 Here is an example of the `ret` object passed to the callback:
 

doc/api/fs.md

@@ -2152,7 +2152,7 @@ by [Naming Files, Paths, and Namespaces][]. Under NTFS, if the filename contains
 a colon, Node.js will open a file system stream, as described by
 [this MSDN page][MSDN-Using-Streams].
 
-Functions based on `fs.open()` exhibit this behavior as well. eg.
+Functions based on `fs.open()` exhibit this behavior as well:
 `fs.writeFile()`, `fs.readFile()`, etc.
 
 ## fs.openSync(path, flags[, mode])