misc/52393: 33.1.2. Building a new kernel: missing -U

[chris%sogubsys.com@localhost]

>Number:         52393
>Category:       misc
>Synopsis:       33.1.2. Building a new kernel: missing -U
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    misc-bug-people
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jul 11 11:45:01 +0000 2017
>Originator:     Chris Humphries
>Release:        
>Organization:
>Environment:
>Description:
On https://www.netbsd.org/docs/guide/en/chap-updating.html in "33.1.2. Building a new kernel" section, the -U flag is missing. 

As written, the kernel will fail to build.

Also, in "33.1.5. Summary" section also has different commands:
- "-u" exists, but doesn't in 33.1.1 and 33.1.2.
- kernel build.sh command has "-U", but 33.1.2 doesn't

>How-To-Repeat:

>Fix:
make 33.1.1 and 33.1.2 match 33.1.5.