fix white space inside link text

Author: rphair

docs/intro/encryption.md

@@ -112,7 +112,7 @@ Beyond this, Linux resources from many quarters identify `7z` as a robust and un
 ## Security conclusions and operational guidelines {#summary}
 
 {: .warning }
-The guarantees here — both of AES's computational impregnability and lack of any back doors into the algorithm — don't apply to any of the encryptable [Microsoft- native document formats](https://en.wikipedia.org/wiki/Office_Open_XML) (DOCX, XLSX, etc., as per [this back-door PoC](https://www.slideshare.net/slideshow/backdoors-with-the-ms-office-file-encryption-master-key-and-a-proposal-for-a-reliable-file-format-by-mitsunari-shigeo-yoshinari-takesako/59669433)), nor to documents [sent with OpenPGP encryption](https://help.libreoffice.org/latest/he/text/shared/guide/openpgp.html) (an algorithm intended for transfer, _not_ encryption at rest).
+The guarantees here — both of AES's computational impregnability and lack of any back doors into the algorithm — don't apply to any of the encryptable [Microsoft-native document formats](https://en.wikipedia.org/wiki/Office_Open_XML) (DOCX, XLSX, etc., as per [this back-door PoC](https://www.slideshare.net/slideshow/backdoors-with-the-ms-office-file-encryption-master-key-and-a-proposal-for-a-reliable-file-format-by-mitsunari-shigeo-yoshinari-takesako/59669433)), nor to documents [sent with OpenPGP encryption](https://help.libreoffice.org/latest/he/text/shared/guide/openpgp.html) (an algorithm intended for transfer, _not_ encryption at rest).
 
 Therefore: make sure in LibreOffice you always save confidential files with **File - Save As** and selecting **Save with password** in [OpenDocument file format](https://help.libreoffice.org/25.8/en-GB/text/shared/00/00000021.html) as indicated here: [Protecting Documents With Passwords When Saving](https://help.libreoffice.org/25.8/en-GB/text/shared/guide/protection.html)