docs: fix overwrite vs. override confusions

overwrite: "to write on or over; cover with writing" [1]
override:  "to take precedence over; preempt or supersede" [2]

1. https://www.dictionary.com/browse/overwrite
2. https://www.dictionary.com/browse/override

Signed-off-by: Carlos Santos <unixmania@gmail.com>

docs/adding-packages-auto.txt

@@ -49,7 +49,7 @@ package buildtime dependencies (+PKG_BUILDDEP+), the package runtime
 dependencies (+PKG_DEPENDS+), the package homepage (+PKG_URL+) and finally the
 internet locations at which the tarball can be downloaded from (+PKG_SITES+).
 Normally ${PKG_NAME}-${PKG_VERSION}.tar.gz will be downloaded. You can
-overwrite the default via the +DISTFILES+ variable. You can add more then one
+override the default via the +DISTFILES+ variable. You can add more then one
 archive name in +DISTFILES+ via space separated. If you have no source archive
 at all, just use the boolean variable +NO_DISTFILES+ and set it to 1.
 

docs/adding-packages-manual.txt

@@ -60,7 +60,7 @@ package buildtime dependencies (+PKG_BUILDDEP+), the package runtime
 dependencies (+PKG_DEPENDS+), the package homepage (+PKG_URL+) and finally the
 internet locations at which the tarball can be downloaded from (+PKG_SITES+).
 Normally ${PKG_NAME}-${PKG_VERSION}.tar.gz will be downloaded. You can
-overwrite the default via the +DISTFILES+ variable. You can add more then one
+override the default via the +DISTFILES+ variable. You can add more then one
 archive name in +DISTFILES+ via space separated. If you have no source archive
 at all, just use the boolean variable +NO_DISTFILES+ and set it to 1.
 

docs/package-reference.txt

@@ -112,15 +112,15 @@ different steps of the configure, build and install process.
 
 * +INSTALL_STYLE+ either manual or auto
 
-* +CONFIGURE_PROG+ overwrite default configure programm
+* +CONFIGURE_PROG+ override default configure programm
 
-* +MAKE_FILE+ overwrite default Makefile
+* +MAKE_FILE+ override default Makefile
 
-* +ALL_TARGET+ overwrite default build target
+* +ALL_TARGET+ override default build target
 
-* +INSTALL_TARGET+ overwrite default install target
+* +INSTALL_TARGET+ override default install target
 
-The variables to add or overwrite preprocessor, compiler and linker flags:
+The variables to add or override preprocessor, compiler and linker flags:
 
 * +TARGET_CPPFLAGS+ flags for the preprocessor