[webcorr] webdoc corr chmod ()

Merging branch 'webcorr'  into 'r21'.

See merge request !1815

hugo/content/installation/install/linux.md

@@ -39,7 +39,7 @@ The installer is self-extracting and does _not_ need root permission.
 
 We recommend installation to a dedicated directory (here `~/ba`):
 ```
-$ chmod +x {{% recommended-linuxinstaller %}} # permit execution
+$ chmod u+x {{% recommended-linuxinstaller %}} # permit execution
 $ {{% recommended-linuxinstaller %}} --help # show options
 $ ba_path='~/ba'
 $ mkdir $ba_path