Fix a few typos

Co-authored-by: Gilles Peskine <gilles.peskine@arm.com>
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/docs/3.0-migration-guide.md b/docs/3.0-migration-guide.md
index ca4f57e..ad5a0ee 100644
--- a/docs/3.0-migration-guide.md
+++ b/docs/3.0-migration-guide.md
@@ -46,7 +46,7 @@
 Deprecated names for PSA constants and types were removed
 ---------------------------------------------------------
 
-Some constants and types that were present in beta version of the PSA Crypto
+Some constants and types that were present in beta versions of the PSA Crypto
 API were removed from in version 1.0 of specification. Please switch to the new
 names provided by the 1.0 specification instead.
 
@@ -153,7 +153,7 @@
 ---------------------------------------------
 
 This does not affect people who used the default `config.h` and the default
-list of ciphersuites, as RC4-based ciehrsuites were already not negociated in
+list of ciphersuites, as RC4-based ciphersuites were already not negotiated in
 that case.
 
 Please switch to any of the modern, recommended ciphersuites (based on
@@ -207,4 +207,3 @@
 
 Please use the new names directly in your code; `scripts/rename.pl` (from any
 of the 2.x releases - no longer included in 3.0) might help you do that.
-