FreeBSD/doc abaaf4e (r53173)en_US.ISO8859-1/books/porters-handbook/makefiles chapter.xml, en_US.ISO8859-1/books/porters-handbook/slow-porting chapter.xml

Make it clear that using sed(1) to patch files is only to be used when
replacing variable content.

Reported by:    swills
Reviewed by:    adamw
Differential Revision:  https://reviews.freebsd.org/D20679
DeltaFile
+4-8en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
+7-1en_US.ISO8859-1/books/porters-handbook/slow-porting/chapter.xml
+11-92 files

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FreeBSD/doc 53173cd (r36953)mn_MN.UTF-8/books/handbook/advanced-networking chapter.sgml, mn_MN.UTF-8/books/handbook/install chapter.sgml

MFen: Resync with the English version of the handbook

Obtained from: FreeBSD Mongolian Documentation project
DeltaFile
+59-9mn_MN.UTF-8/books/handbook/install/chapter.sgml
+10-2mn_MN.UTF-8/books/handbook/advanced-networking/chapter.sgml
+69-112 files

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