Fix spelling mistakes in //docs.

docs/memory-infra/heap_profiler.md

 # Heap Profiling with MemoryInfra
 
 As of Chrome 48, MemoryInfra supports heap profiling. The core principle is
 a solution that JustWorks™ on all platforms without patching or rebuilding,
-intergrated with the chrome://tracing ecosystem.
+integrated with the chrome://tracing ecosystem.
 
 [TOC]
 
 ## How to Use
 
  1. Start Chrome with the `--enable-heap-profiling` switch. This will make
     Chrome keep track of all allocations.
 
  2. Grab a [MemoryInfra][memory-infra] trace. For best results, start tracing
     first, and _then_ open a new tab that you want to trace. Furthermore,
@@ skipping 98 matching lines @@
 The other way to break down the heap is by object type. At the moment this is
 only supported for PartitionAlloc.
 
 *** aside
 In official builds, only the most common type names are included due to binary
 size concerns. Development builds have full type information.
 ***
 
 To keep the trace log small, uninteresting information is omitted from heap
 dumps. The long tail of small nodes is not dumped, but grouped in an `<other>`
-node instead. Note that altough these small nodes are insignificant on their
+node instead. Note that although these small nodes are insignificant on their
 own, together they can be responsible for a significant portion of the heap. The
 `<other>` node is large in that case.
 
 ## Example
 
 In the trace below, `ParseAuthorStyleSheet` is called at some point.
 
 ![ParseAuthorStyleSheet pseudo stack][pseudo-stack]
 
 The pseudo stack of trace events corresponds to the tree of ƒ nodes below. Of
@@ skipping 24 matching lines @@
 memory allocated by PartitionAlloc alone, the total renderer memory increase was
 around 72 MiB.)
 
 ![Diff of The Verge before and after loading ads][diff]
 
 [pseudo-stack]:            https://storage.googleapis.com/chromium-docs.appspot.com/058e50350836f55724e100d4dbbddf4b9803f550
 [break-down-by-backtrace]: https://storage.googleapis.com/chromium-docs.appspot.com/ec61c5f15705f5bcf3ca83a155ed647a0538bbe1
 [break-down-by-type]:      https://storage.googleapis.com/chromium-docs.appspot.com/2236e61021922c0813908c6745136953fa20a37b
 [type-then-backtrace]:     https://storage.googleapis.com/chromium-docs.appspot.com/c5367dde11476bdbf2d5a1c51674148915573d11
 [diff]:                    https://storage.googleapis.com/chromium-docs.appspot.com/802141906869cd533bb613da5f91bd0b071ceb24