bundle doc: replace "basis" with "prerequsite(s)"

In the preceding commits we introduced new documentation that talks
about "[commit|object] prerequsite(s)", but also faithfully moved
around existing documentation that talks about the "basis".

Let's change both that moved-around documentation and other existing
documentation in the file to consistently use "[commit|object]"
prerequisite(s)" instead of talking about "basis". The mention of
"basis" isn't wrong, but readers will be helped by us using only one
term throughout the document for this concept.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

Documentation/git-bundle.txt

@@ -147,13 +147,13 @@ SPECIFYING REFERENCES
 Revisions must accompanied by reference names to be packaged in a
 bundle.
 
-More than one reference may be packaged, and more than one basis can
+More than one reference may be packaged, and more than one set of prerequisite objects can
 be specified.  The objects packaged are those not contained in the
-union of the given bases.
+union of the prerequisites.
 
 The 'git bundle create' command resolves the reference names for you
 using the same rules as `git rev-parse --abbrev-ref=loose`. Each
-basis can be specified explicitly (e.g. `^master~10`), or implicitly
+prerequisite can be specified explicitly (e.g. `^master~10`), or implicitly
 (e.g. `master~10..master`, `--since=10.days.ago master`).
 
 All of these simple cases are OK (assuming we have a "master" and
@@ -236,7 +236,7 @@ but we can move data from A to B via some mechanism (CD, email, etc.).
 We want to update R2 with development made on the branch master in R1.
 
 To bootstrap the process, you can first create a bundle that does not have
-any basis. You can use a tag to remember up to what commit you last
+any prerequisites. You can use a tag to remember up to what commit you last
 processed, in order to make it easy to later update the other repository
 with an incremental bundle:
 
@@ -287,7 +287,7 @@ machineB$ git pull
 
 If you know up to what commit the intended recipient repository should
 have the necessary objects, you can use that knowledge to specify the
-basis, giving a cut-off point to limit the revisions and objects that go
+prerequisites, giving a cut-off point to limit the revisions and objects that go
 in the resulting bundle. The previous example used the lastR2bundle tag
 for this purpose, but you can use any other options that you would give to
 the linkgit:git-log[1] command. Here are more examples:
@@ -298,7 +298,7 @@ You can use a tag that is present in both:
 $ git bundle create mybundle v1.0.0..master
 ----------------
 
-You can use a basis based on time:
+You can use a prerequisite based on time:
 
 ----------------
 $ git bundle create mybundle --since=10.days master
@@ -311,7 +311,7 @@ $ git bundle create mybundle -10 master
 ----------------
 
 You can run `git-bundle verify` to see if you can extract from a bundle
-that was created with a basis:
+that was created with a prerequisite:
 
 ----------------
 $ git bundle verify mybundle